n. bomb hoax：炸弹恐吓
A series of bomb hoaxes has disrupted Christmas shopping in the city centre.
It was a hoax.
We can't discount the possibility that the letter is a hoax.
a hoax call：恶作剧电话
He denied making the hoax call but was convicted after a short trial.
He was jailed for six months for making a hoax bomb threat.