crack(sb)up
—phrasal verbwithcrackverbuk/kræk/us/kræk/
informalC2
tosuddenlylaugha lot, or to make someonesuddenlylaugha lot
（使）…突然哈哈大笑；（使）…捧腹大笑
I took onelookat her andcrackedup.我看了她一眼，便哈哈大笑起来。
There's something about that guy'sfacethat justcracksme up.那家伙的脸上有什么地方让我直想哈哈大笑。