pester

Compared meaning: to annoy or repeatedly bother someone (verb).

比较义项：惹恼、纠缠（动词）。

• bug

  The mildest and most general word: describes something that irritates or bothers you, not necessarily through repeated requests; very casual, everyday register.

  语气最轻、意思最笼统：泛指让人心烦或恼火的事，不一定是反复提出要求；非常口语化，日常常用。

  It really bugs me when people chew with their mouths open.

  别人张着嘴嚼东西的时候，真的让我很恼火。

• pester 本词

  Means to annoy someone with repeated requests, questions or interruptions, often a child or someone eager for something; mildly negative but not harsh.

  指用反复的要求、提问或打扰来烦某人，常用于孩子或急于得到某样东西的人；带轻微负面语气，但不算强硬。

  My daughter keeps pestering me for a new phone every day.

  我女儿每天都缠着我要一部新手机。

• badger

  Stronger and more forceful than pester: to keep pressuring someone insistently, often until they give in; frequently used with 'into doing something'.

  比 pester 更强硬、更有压迫感：不断向对方施压，往往直到对方让步为止；常用“badger somebody into doing something”这种搭配。

  He badgered the manager into giving him a refund.

  他不断纠缠经理，直到对方同意退款给他。

All three mean annoying someone, but with different strength. Bug is mildest and most casual, for anything irritating, not necessarily repeated requests. Pester means annoying with repeated requests, often like a child; mildly negative. Badger is stronger, meaning to pressure someone until they give in.

这三个词在“惹恼、纠缠”这个意义上很接近，但语气和用法不同：bug 泛指让人心烦，不一定是反复提出要求；pester 和 badger 更强调反复纠缠或催逼，badger 语气更强硬。这里不比较 bug 的“虫子”“故障”“窃听”等其他意思。