1. to mark something so that it can be easily found or noticed
標記（以便容易找到或注意到）
Please flag any important emails for follow-up.
請將任何需要跟進的重要郵件標記起來。
I flagged the suspicious transaction in the report.
我在報告中標記了那筆可疑的交易。
Flag Meaning（定義、用法、例句與發音）
flag
verb
快速理解
What does "Flag" mean?What are 2-3 core uses of "Flag"?
作為動詞，flag 主要表示標記、引起注意或變得疲弱。
- 1
標記 / 做記號
EN: to mark something for attention or review
翻譯: 為引起注意或審查而標記某事物。
- 2
示意 / 發出信號
EN: to signal or wave to get someone's attention
翻譯: 揮動信號或揮手以引起某人注意。
- 3
變得疲弱 / 衰退
EN: to become tired, weak, or less enthusiastic
翻譯: 變得疲倦、虛弱或熱情減退。
- 4
舉報 / 標示問題
EN: to report or identify something as problematic
翻譯: 舉報或指出某事物有問題。
小提醒：注意 flag 作動詞時，常與介系詞搭配使用，如 flag something for review（標記某物以供審查）、flag someone down（揮手示意某人停下），其含義會因搭配而異。
發音（How to Pronounce "Flag" in English）
How to pronounce "Flag" in English?"Flag" US vs UK pronunciation
點擊下方的 US / UK 按鈕可播放發音。
Real-life Examples of "Flag" from YouTube Videos
Jessica Livingston on Cofounder Disputes and Making Something People Want
Y Combinator
“don't think it'll just go away. it's a red flag when you find yourself worrying whether you're co-founder, is trustworthy, or whether he or she works hard enough or is competent.”
(1 out of 15)
Definitions（定義）
What are the definitions of "Flag"?How does "Flag" change by context?
2. to signal to stop, especially a vehicle, by waving
揮手示意（尤指車輛）停下
She flagged down a taxi on the busy street.
她在繁忙的街道上揮手攔下了一輛計程車。
The police officer flagged the truck to pull over.
警察揮手示意卡車靠邊停車。
3. to become tired, weak, or less enthusiastic
變得疲憊、衰弱或熱情減退
His energy flagged after working for twelve hours straight.
連續工作十二小時後，他的精力開始衰退。
Interest in the project began to flag after the initial excitement.
最初的興奮過後，大家對這個專案的興趣開始減弱。
4. to bring to attention for being problematic or against the rules
指出（問題或違規之處）
The system automatically flags plagiarized content.
系統會自動標示出抄襲的內容。
The referee flagged the player for a foul.
裁判指出那名球員犯規。
Grammar & Patterns（句型）
What are common sentence patterns for "Flag"?How to make natural sentences with "Flag"?
| Pattern | Meaning | Example |
|---|---|---|
| flag + noun | 標記（某物） | The system will flag suspicious transactions for review. (系統會標記可疑交易以供審查。) |
| flag + noun + as + noun/adjective | 將…標記為… | The moderator flagged the comment as inappropriate. (版主將該留言標記為不當內容。) |
| flag + up | 引起注意；標示出 | Could you flag up any errors in this report? (你能把這份報告裡的任何錯誤標示出來嗎？) |
| be/get flagged | 被標記；被注意 | His application was flagged due to missing information. (他的申請因資料不全而被標記。) |
| flag + that-clause | 指出…；標明… | The report flags that there are significant risks involved. (報告指出其中涉及重大風險。) |
用法說明
How is "Flag" different from similar structures?What usage mistakes are common with "Flag"?
flag doing vs flag to do
- flag doing 通常用於表示「標記出」一個持續的、已發生的或作為一個整體概念的行為或事件。
- flag to do 則常與特定目的、意圖或未來需要處理的單一任務有關，有時暗示著「為了...而標記」。
- 在許多情況下，兩者可以互換使用，語意差異細微。但 flag for + 名詞（如 review, attention）是更常見且自然的搭配，用於說明標記的目的。 EN: The system will automatically flag repeated login attempts for security review. 翻譯: 系統會自動標記重複的登入嘗試，以進行安全審查。
EN:I flagged this email to remind myself to reply tomorrow.
翻譯:我標記了這封電子郵件，提醒自己明天要回覆。
總結建議
在表示「為特定後續處理而標記」時，使用 flag something to do 或更常見的 flag something for + 名詞 結構通常比 flag doing 更為自然精確。
易混淆對比
What is the difference between "Flag" and similar words?How to choose "Flag" vs alternatives?
flag vs mark
「flag」通常指標記出有問題或需要審查的項目，而「mark」則泛指任何形式的標記或註記。
flag vs identify
「flag」強調標示出行動點，而「identify」側重於辨認出本質或身分。
flag vs label
「flag」通常作為動詞，指動態的標記行為；「label」可作動詞或名詞，指貼上分類或說明的標籤。
口語用法
How is "Flag" used in spoken English?What is the spoken vs formal difference for "Flag"?
引述
在對話中，人們有時會用「flag」來引述或重述一個先前被標記出的潛在問題，通常帶有「我早就說過」的語氣。 EN: I told you his constant lateness would be a problem. I flagged it months ago. 翻譯: 我早就跟你說過他老是遲到會是個問題，我幾個月前就提出警告了。
EN:She flagged the budget issue in the meeting, and now we're seeing the consequences.
翻譯:她在會議上就提出了預算問題的警告，現在我們看到後果了。
語氣強調
在非正式交談中，「flag」常與「up」連用（flag up），以強調主動、醒目地指出某事，引起他人注意。 EN: Just flagging up that the deadline is tomorrow, so don't forget! 翻譯: 提醒一下，截止日期是明天，別忘了！
EN:Can you flag up any typos you find in the document?
翻譯:你能把在文件裡找到的任何錯字標出來嗎？
停頓填充
在組織思緒或尋找合適詞語時，說話者可能會用「Let me flag...」或「Just to flag...」作為暫時的停頓，引出接下來要強調的點。 EN: So, the main points are... let me flag this one in particular. 翻譯: 所以，主要重點是…讓我特別標出這一點。
EN:Just to flag, there's a small change in the schedule for next week.
翻譯:順帶一提，下週的行程有個小變動。
正式寫作注意：在正式報告或學術寫作中，應避免使用「flag up」或「just to flag」這類口語化片語。建議改用更正式的詞彙，如「indicate」、「highlight」、「note」、「bring to attention」或「point out」。
常見短語
What common collocations use "Flag"?What fixed phrases with "Flag" should I remember?
flag down
flag down [vehicle/person]
揮手示意（車輛或人）停下
flag up
flag up [issue/concern]
標示出（問題或疑慮）；引起注意
flag as
flag [something] as [category/priority]
將某事物標記為（某類別或優先級）
flag for
flag [something] for [attention/review/action]
為（關注、審查或行動）而標記某事物
flag on
flag [someone] on
揮旗示意（某人）繼續前進
flag off
flag off [event/race]
揮旗示意（活動或比賽）開始
常見錯誤
What are common mistakes with "Flag"?Which "Flag" sentences look correct but are wrong?
×The system flagged out the suspicious transaction.
✓The system flagged the suspicious transaction.
The verb 'flag' is transitive and does not require the preposition 'out' when used to mean 'mark or identify as important or problematic.'
×I will flag you if you have any questions.
✓I will flag this for you if you have any questions. / I will bring this to your attention if you have any questions.
'Flag' typically takes an object that is a thing (issue, item, problem), not a person. It means to mark something for attention, not to notify a person directly.
×His energy flagged down after the long meeting.
✓His energy flagged after the long meeting.
The verb 'flag' meaning 'to become tired or less energetic' is intransitive and does not take the particle 'down.' 'Flag down' is a separate phrasal verb meaning to signal a vehicle to stop.
×She flagged the email for follow.
✓She flagged the email for follow-up.
The correct noun form following 'for' is 'follow-up' (as a compound noun or adjective meaning subsequent action), not the verb 'follow.'
×The moderator will flag content which is inappropriate.
✓The moderator will flag content that is inappropriate.
In restrictive relative clauses defining the type of content, 'that' is more commonly used than 'which' in modern English, especially in American English. Using 'which' here is not grammatically wrong but is a stylistic choice that learners often misuse.
詞形變化
What are the word forms of "Flag"?What are tense/participle forms of "Flag"?
flags(3rd_singular)flagging(present_participle)flagged(past)flagged(past_participle)