1. Get on the hook 上钩，自投罗网
He got on the hook because of his greed.
他因为贪婪而自投罗网。
疯狂联想：自己挂到了钩上，即自投罗网。
2. Get sth. off one's chest 发泄（情绪，不快）
I always feel much better after I get something miscrable off my chest.
每次我把胸中的不快发泄出来以后，心情都会好很多。
链接：
宣泄：
get the steam off one's chest
vent out