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be a sucker for sth
表示对某事毫无抵抗力。
He is a sucker for a sob story.
他特别容易被悲惨故事打动。
容易上当的人；傻瓜
先理解核心含义，再看它在真实句子里的用法。
容易上当的人；傻瓜
a person who is easily deceived or taken advantage of
He is a sucker for a sob story.
他特别容易被悲惨故事打动。
吸吮的人或动物,尤其是哺乳动物,未断奶的幼兽
A person or animal that sucks, especially a breast or udder; especially a suckling animal, young mammal before it is weaned.
容易上当受骗的人
a person who is gullible and easy to take advantage of
从灌木或树的根部或下干长出的不需要的枝条,尤其是嫁接植物或树的根茎
An undesired stem growing out of the roots or lower trunk of a shrub or tree, especially from the rootstock of a grafted plant or tree.
从植物根部长出的芽
a shoot arising from a plant's roots
Don't be a sucker; always double-check a salesperson's claims.
别当冤大头；对销售员的话要多加核实。
The street seller spotted the suckers in the crowd and raised the price.
街头小贩看出人群里有几个好骗的人，于是抬高了价格。
She felt like a sucker when she realized the online deal was fake.
当她发现那个网上交易是假的时候，觉得自己像个傻瓜。
表示对某事毫无抵抗力。
He is a sucker for a sob story.
他特别容易被悲惨故事打动。
劝告他人不要轻易受骗。
Don't be a sucker; check the facts first.
别上当，先核实事实。
指占某人便宜。
They took me for a sucker.
他们把我当傻瓜。
Not this
He is sucker.
Use this
He is a sucker.
英语中可数名词单数前需要加冠词，而汉语没有冠词，学习者容易遗漏。这里 'sucker' 指一个容易上当的人，是单数可数名词，所以前面要加 'a'。
Not this
They are sucker.
Use this
They are suckers.
英语可数名词复数需要加-s，而汉语没有复数标记。这里主语是复数，所以名词要用复数形式 'suckers'，并且复数名词前不需要冠词。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
对……毫无抵抗力；容易被……吸引
She's a sucker for romantic movies.
她对浪漫电影毫无抵抗力。
把某人当傻瓜耍
Don't try to play me for a sucker—I know exactly what you're doing.
别想把我当傻瓜耍——我完全知道你在干什么。
稳输的赌局；傻瓜才下注的赌局
That investment plan is a sucker bet.
那个投资计划是一场必输的赌局。
容易上当的人比比皆是；傻瓜随时都有
He actually believed the email scam — there's a sucker born every minute.
他居然相信了那封诈骗邮件——真是随时随地都有傻瓜。
根蘖；根出条
The root sucker needs to be cut away from the tree.
需要把这棵树长出的根蘖剪掉。
出其不意的重拳；暗算
The boxer lost the fight after a sucker punch in the third round.
这位拳击手在第三回合被一记冷拳击中，输掉了比赛。
必输的赌注；骗人的赌局
He thought he could win, but the whole game was a sucker bet.
他以为自己能赢，但整个赌局都是一个骗人的陷阱。
对…毫无抵抗力；特别喜爱
I'm a total sucker for romantic comedies.
我对浪漫喜剧毫无抵抗力。
每分钟都有一个容易受骗的人出生。
Don't be a sucker—check the facts before you pay.
别当冤大头——付钱之前先核实事实。
Use sucker naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
sucker 拆成 suck（吸）+ er（者）：吸奶的幼崽；也联想容易上当的人像被“吸”走钱财的人。
语域：informal 常见场景：casual conversation、social media、informal text messages 此处 sucker 指“容易上当的人”，是比较口语化的说法，多用于日常对话、社交媒体或非正式文字。它通常暗示某人容易被骗或容易轻信别人；在正式写作中较少使用，可考虑换成 gullible person 或 someone easily deceived。
常用于口语，表示容易受骗的人。
Dictionary facts from ECDICT, WIKTIONARY.