Definition: to laugh in a nervous or silly way Level: C2
她在演讲期间紧张地咯咯笑了起来。
She ___giggled nervously during the speech.
那位老妇人像害羞的女学生一样咯咯地笑。
The old lady ___giggled like a shy schoolgirl.
别咯咯笑了！没那么好笑！
Stop ___giggling! It's not that funny!
