Meaning of “wail” - Learner’s Dictionary

wail

verb uk us /weɪl/
PERSON

[ I, T ] to cry loudly because you are very unhappy:

"I've lost my mummy," she wailed.
DANGER

[ I ] If a siren (= loud noise to warn of danger) wails, it makes a noise:

Somewhere in the distance a police siren was wailing.
wail noun [ C ]

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