Meaning of ざる得ない in Japanese

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Definition of ざる得ない

ざるえない(zaruenai) 【ざる得ない】

(exp) cannot help (doing); have no choice but to →Related words: ざるを得ない
私達は生活費を切り詰めざる得ない。
We cannot avoid cutting down our living expenses.

せざるえない(sezaruenai) 【せざる得ない】

(exp, adj-i) cannot avoid doing; cannot help but (do); is compelled to do; (feel) obliged to (do); has to do →Related words: ざる , せざるを得ない
彼は書類に署名せざる得なかった。
He was forced to sign the document.