fall back on somebody

Từ điển Oxford Advanced Learner 8th

ˌfall ˈback on sb/sth derived
no passive to go to sb for support; to have sth to use when you are in difficulty
•I have a little money in the bank to fall back on.
•She fell back on her usual excuse of having no time.
related noun ↑fallback
Main entry: ↑fall_derived