ざるを得ない

Usage

Doesn't want to -, but circumstances do not permit to avoid -, so that one reluctantly has to -

V ない~~ない~~ + ざるえない / する -> せざるえない

私はそうせざるを得ない。 I have no choice but to do that.

いやな仕事でも、生活のためには続けざるを得ない。 Even if it's work you don't like, you must continue working in order to maintain your livelihood