不完全是一回事。
1. 习语 = 成语 = idiom ,这跟汉语的成语是一个意思。是人类语言长期以来约定俗成的、不完全等同于字面意的一种表达(带有引申义和比喻义):An idiom is a group of words which have a different meaning when used together from the one they would have if you took the meaning of each word separately.
2. 固定搭配:是指某个词组形成固定的搭配格式,但不是“习语,成语”。英文是:
a set phrase
a set structure
a fixed collocation
a fixed expression
【比较】
习语、成语:as busy as a bee(十分忙碌),all thumbs (笨手笨脚)
固定搭配:take care of(照料), be good at (擅长),at last(最后)
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