oust

Compared meaning: to force someone out of a group or position (verb).

比较义项：驱逐、罢免（把某人赶出某个组织、职位或地方）（动词）。

• expel

  Used when a school, party, country or other organization formally removes a member as punishment for breaking rules; the person loses membership, not necessarily power.

  用于学校、政党、国家等组织因违反规定而正式将某成员除名，强调失去成员资格，不一定涉及权力。

  The school decided to expel the student for cheating twice.

  学校决定将这名学生开除，因为他两次考试作弊。

• oust 本词

  Used specifically for forcing someone out of a position of power or leadership, often through a vote, scandal or coup, rather than removing them from membership.

  专门用于把某人赶下权力或领导职位，常通过投票、丑闻或政变实现，而不是取消其成员资格。

  The shareholders voted to oust the company's chief executive.

  股东们投票罢免了公司的首席执行官。

Both mean forcing someone to leave, but the target differs. Expel means a school, party, or country removes a member for breaking rules. Oust means forcing someone from a position of power, often by vote or scandal. Expel's 'gas or liquid' sense is not compared.

两个词都表示强行让某人离开，但 expel 常指学校、政党、国家等组织因违规而正式除名，强调失去成员资格；oust 专指把人赶下权力或领导岗位，常通过投票、丑闻或政变实现，强调失去权力。此外，这里不比较 expel 表示“排出（气体、液体等）”的义项。