get by on something

Từ điển Oxford Advanced Learner 8th

ˌget ˈby (on/in/with sth) derived
to manage to live or do a particular thing using the money, knowledge, equipment, etc. that you have
• How does she get by on such a small salary?
• I can just about get by in German (= I can speak basic German).
Main entry: ↑get_derived