Explanation
Means 'cannot help but do', 'will definitely do', or 'is bound to happen'.
Formation
Verb-ない form + ではおかない
Detailed explanation
The pattern Verb ないではおかない indicates that something definitely occurs as a logical or emotional consequence. It can be translated as 'cannot not do', 'can’t help but do', or 'will inevitably do'. The verb is put in the negative form followed by ないではおかない.
Examples
Kanojo wa maikai chikoku o shite wa, sensei ni okorarenaide wa okanai.
Every time she's late, she inevitably gets scolded by the teacher.
Oishii mono ga areba, kare wa tabenai de wa okanai.
If there's delicious food, he can't help but eat it.
Kono shōsetsu wa kandōteki de, yomeba namida o nagasanai de wa okanai.
This novel is so moving that you can't help but shed tears when you read it.
Mainichi renshū shite iru kara, shiai de wa katanai de wa okanai darō.
He practices every day, so he's bound to win the match.
Practice
Grammar content sourced from hanabira.org.