When you crack up, it can either mean you've had a bit of a mental break down, or the complete opposite, you've laughed really hard at something.

Crack up既可以表示精神崩溃，也可以表示完全相反的义，即因某事而放声大笑。

Okay, synonyms, antonyms, which is the opposite meaning.

好的，义词，反义词——相反义的词。

Sometimes gestures used in different languages have contrary meanings.

有些动作出现的语系里便有完全相反的义。

You might think that the opposite of short-tempered would be long-tempered, but in fact, there is no such word as long-tempered, at least as an opposite in meaning.

你可能会认为 short-tempered 的反义词 long-tempered，但事实上，没有 long-tempered 这个词，至少义上相反的。

Monckton Milnes was a singular type, but his distant cousin, James Milnes Gaskell, was another, quite as marked, in an opposite sense.

蒙克顿·米尔内斯 (Monckton Milnes) 一个独特的类型， 但他的远房表弟詹姆斯·米尔内斯·加斯克尔 (James Milnes Gaskell) 另一个， 相反的义上非常明显。

4-2 have exactly the same words in number and form and are both grammatically well formed, but they have opposite meanings.

其他情况下，例4-2中引用的两个句子数量和形式上完全相，并且都符合语法，但它们的义相反。