if you have a hand-to-mouth life, you spend all the money you earn on basic needs such as food and do not have anything left 仅够糊口的;勉强维持生计的 Oxford Collocations DictionaryHand-to-mouth is used with these nouns:- existence
Idioms
live (from) hand to mouth
to spend all the money you earn on basic needs such as food without being able to save any money 仅够糊口度日