go (或 be) bananas

(informal,)become (or be) mad or extremely silly

(非正式)發(fā)瘋

everyone's beginning to think I'm bananas.

每個(gè)人都認(rèn)為我瘋了。

top (或 second) banana

(informal chiefly N. Amer.)the most (or second most) important person in an organization or activity

(非正式，主 北美)（機(jī)構(gòu)或活動(dòng)中的）頭號(hào)（或二號(hào)）人物