IPA: //ˈlaɪfˌbɛlt//
KK: /ˈlaɪfˌbɛlt/
A safety device, often made of buoyant material, that is used to help keep a person afloat in water.
The sailor threw a lifebelt to the man who had fallen overboard.
Lifebelt → It is formed from "life" (from Old English "līf", meaning existence or living) and "belt" (from Old English "bælt", meaning a band or strap). The word "lifebelt" refers to a strap or band designed to support or save a person in the water, thus preserving life.
Think of a 'belt' that helps to keep you safe in the water, preserving your 'life' — that's what a lifebelt is for.
No commonly confused words.