IPA: /ˈnaɪtˌstɪk/
KK: /ˈnaɪtˌstɪk/
A type of club that is used by police officers for self-defense or to control situations.
The officer used his nightstick to maintain order during the protest.
Nightstick → The word is formed from "night" (from Old English "niht", meaning the period of darkness) and "stick" (from Old English "sticca", meaning a stick or rod). A nightstick is a stick used during the night, typically by law enforcement for protection or control.
Think of the period of darkness ('night') and a long object ('stick') used for protection — that's why a nightstick is a stick used at night.
No commonly confused words.