hold out

to continue to defend yourself against an enemy or attack without being defeated:
They won't be able to hold out much longer under this sort of bombardment.

If a supply of something such as food or money holds out, there is enough of it to last for a particular period of time.
(Cambridge Advanced Learner's Dictionary & Thesaurus からの hold out の定義 © Cambridge University Press)

アメリカ英語辞典
to continue in a situation that is dangerous or difficult:
They won’t be able to hold out much longer against these attacks.

If something holds out, it continues to be useful or enough:
The sensors are designed to work as long as their batteries hold out.
(Cambridge Academic Content Dictionary からの hold out の定義 © Cambridge University Press)

- Cambridge Dictionary