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 tennis 球棒；球拍；球板 
a baseball/cricket bat 棒球球棒；板球球板
Oxford Collocations Dictionaryadjective- baseball
- cricket
- table-tennis
- …
- grip
- hold
- carry
- …
an animal like a mouse with wings that flies and feeds at night (= it is nocturnal). There are many types of bat. 蝙蝠 
Oxford Collocations Dictionaryadjective- fruit
- vampire
- etc.
- …
- flutter
- fly
- hang
- …
Word Originnoun sense 1 late Old English batt ‘club, stick, staff’, perhaps partly from Old French batte, from battre ‘to strike’. noun sense 2 late 16th cent.: alteration, perhaps by association with medieval Latin batta, blacta, of Middle English bakke, of Scandinavian origin.
Idioms
at bat
(in baseball 棒球 trying to hit the ball with a bat 用球板擊球，用球棒擊球（尤指板球或棒球運動） It's his first time at bat in the major leagues. 這是他第一次在大聯盟打球。
(as) blind as a bat
- (humorous)
not able to see well 視力不佳 She’s as blind as a bat without her glasses. 她不戴眼鏡就像蝙蝠一樣瞎。
More Like This Similes in idiomsSimiles in idioms- (as) bald as a coot
- (as) blind as a bat
- (as) bright as a button
- (as) bold as brass
- as busy as a bee
- as clean as a whistle
- (as) dead as a/the dodo
- (as) deaf as a post
- (as) dull as ditchwater
- (as) fit as a fiddle
- as flat as a pancake
- (as) good as gold
- (as) mad as a hatter/a March hare
- (as) miserable/ugly as sin
- as old as the hills
- (as) pleased/proud as Punch
- as pretty as a picture
- (as) regular as clockwork
- (as) quick as a flash
- (as) safe as houses
- (as) sound as a bell
- (as) steady as a rock
- (as) thick as two short planks
- (as) tough as old boots
like a bat out of hell
- (old-fashioned, informal)
very fast 疾速地；迅速地 She was driving like a bat out of hell. 她開得飛快。
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 support from anyone else 自覺地；主動地 She made the suggestions entirely off her own bat. 她完全憑直覺提出了這些建議。
right off the bat