to secretly look at something for a short time, usually through a hole

I saw her peeping through the curtains/into the room. 我看见她透过窗帘／向房间偷看。

to appear slowly and not be completely seen

A few early flowers had peeped up through the snow. 几朵早开的花从雪地里探出头来。

The cat's tail was peeping out from under the bed. 猫的尾巴从床底下露了出来。

to make a weak high noise

a statement, answer, or complaint

No one has raised a peep about this dreadful behaviour. 对如此恶劣的行径竟没有人吱声。

One more peep out of you and there'll be no television tomorrow. 你再抱怨一声，明天就不准看电视了。

There hasn't been a peep out of (= any form of communication from) my sister for a couple of weeks. 好几周没有我妹妹的消息了。

the weak high noise made by young birds

a quick look

Take/Have a peep at what it says in this letter. 看一眼这封信上说了什么。