1
be a nag about [sth]
指爱唠叨的人，常用于口语，含贬义；about 后接让人唠叨的话题。
My boss is a nag about deadlines.
我老板老是唠叨截止日期的事。
爱唠叨的人；令人心烦的事物
nags — plural of nag
先理解核心含义，再看它在真实句子里的用法。
爱唠叨的人；令人心烦的事物
someone or something that nags
My boss is a nag about deadlines.
我老板老是唠叨截止日期的事。
小马；矮马。
A small horse; a pony.
爱唠叨的人或事物。
Someone or something that nags.
衰老无用的马。
An old, useless horse.
反复的抱怨或提醒。
A repeated complaint or reminder.
The old nag could barely pull the cart up the hill.
那匹老马几乎拉不动车上坡。
He bought a cheap nag at the horse fair, but it was too weak to ride.
他在马市上买了一匹便宜的劣马，但它太弱了不能骑。
The farmer's nag was well past its prime, yet it still worked every day.
农场主的那匹老马早已过了壮年，却仍然每天劳作。
指爱唠叨的人，常用于口语，含贬义；about 后接让人唠叨的话题。
My boss is a nag about deadlines.
我老板老是唠叨截止日期的事。
指马时通常指年老或瘦弱的马，带有轻蔑或怜悯的语气。
They sold the old nag to a farmer.
他们把那匹老马卖给了一个农民。
Not this
My sister is a terrible nagging.
Use this
My sister is a terrible nag.
nagging 是动词 nag 的现在分词/动名词，表示“唠叨”的动作，不能用来指人；作名词表示“爱唠叨的人”要用 nag。因此需把动名词改为名词 nag。
Not this
Stop your nag, please.
Use this
Stop your nagging, please.
名词 nag 指的是“爱唠叨的人”或“马”，并不表示“唠叨”这个行为或习惯；要表达“停止唠叨”，需用动名词 nagging。因此需把名词改为动名词。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
老而无用的马；劣马
The farmer's old nag could barely pull the cart.
农场主的那匹老马几乎拉不动车。
有点爱唠叨的人
My mother is a bit of a nag about my schoolwork.
我妈妈对我的学业有点爱唠叨。
Use nags naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
老马叫 nag，爱唠叨的人也叫 nag——都让人心烦。
语域：informal 常见场景：informal spoken conversation、family or close relationships、complaining about someone's behavior nag 作名词表示“爱唠叨的人”时，通常属于非正式口语用法，多用于家人、伴侣或熟人之间形容某人爱反复抱怨或催逼。正式文体中较少出现，常见于日常对话或轻松语境。
All six words rhyme with “nag” (/næɡ/), sharing the final /æɡ/ sound and the spelling “-ag”. Beware lookalikes ending in “-age” such as “page” (/peɪdʒ/) or “stage” (/steɪdʒ/), which do not rhyme.
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.