Definition of bat noun from the Oxford Advanced Learner's Dictionary

bat

noun

bæt

bæt

1 a piece of wood with a handle, made in various shapes and sizes, and used for hitting the ball in games such as baseball, cricket and table tennisa baseball/cricket bat compare racket2 an animal like a mouse with wings, that flies and feeds at night (= it is nocturnal ). There are many types of bat. see also fruit bat, old bat, vampire bat

Idioms

like a bat out of hell

(informal) very fastShe was driving like a bat out of hell.

off your own bat

(British English, informal) if you do something off your own bat, it is your own idea and you do it without help or encouragement from anyone elseShe made the suggestions entirely off her own bat.

more at blind as a bat at blind adjective, right off the bat at right adverb