To get by is to manage to survive with just barely enough. Get by on very little, just about get by, enough to get by.
It says nothing about comfort, only about not going under. It takes on before the thing you manage with, as in get by on forty pounds a week.
1phraseget byTo manage to survive with just barely enough.
“They get by on one wage and a great deal of care.”
get by is a phrase.
Also accepted in games: cope
Practised in Phrasal Verbs