/ˈlaɪfbelt ||; ˈlaɪfˌbɛlt/(also lifebuoy /ˈlaɪfbɔɪ ||; ˈlaɪfˌbɔɪ/) noun [C] (Brit 英) a ring that is made from light material which will float. A lifebelt is thrown to a person who has fallen into water to stop him/her from sinking. 救生圈