freak out 大吃一惊、惊恐(吓呆)、暴怒、崩溃(情绪失控、表现失常、抓狂)、激动、大惊小怪

【例句】
I was gonna tell him today. he's probably gonna freak out.
今天我要告诉他。他恐怕会大吃一惊。

She will freak out every time she is disappointed.
每次没有如她所愿时她都会抓狂。