IPA: /ˈflaɪˌswɔːtə/
KK: /ˈflaɪˌswɔtər/
A tool used to hit and kill flies or other insects, usually made of a flat surface attached to a handle.
I used a flyswatter to get rid of the flies buzzing around the kitchen.
Flyswatter → The word is formed from "fly" (from Old English *flēoge*, meaning a small winged insect) and "swatter" (from the verb "swat", meaning to hit or strike). A flyswatter is a tool used to hit or strike flies, the small insects.
Think of a tool that 'strikes' ('swat') at 'flies' — that's why a flyswatter is used to hit flies.