From Longman Dictionary of Contemporary Englishnightsticknight‧stick /ˈnaɪtˌstɪk/ noun [countable] American English PMWSCPa short thick stick carried as a weapon by police officers SYN truncheon British English
Examples from the Corpus
nightstick• It looked like a nightstick now.• The city - it is the city that will have to heal them, with knifeblade and automobile, nightstick, gunshot.• The string of blackshirts was re-deployed, four spotlights had them caught in a box of gauzy light, their nightsticks fisted.• The police block us with their nightsticks.• Police responded with nightsticks and pepper spray, further inflaming the crowd. 