Meaning of “bid” - Learner’s Dictionary

bid

verb uk us /bɪd/ (present participle bidding, past tense and past participle bid, bade, past participle bid, bidden)
bid sb farewell/goodbye/good night, etc literary

to say goodbye, good night, etc:

She bade her guests goodnight.

(Definition of “bid verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)