決きめ込こむ

1. 1to take for granted ; to assume ; to be convinced (that) ; to jump to the conclusion (that) Translated by Jiyomi
2. 2to pretend (to be) ; to pose (as) ; to fancy oneself (to be) ; to feign (e.g. ignorance)
3. 3to go through with (what one decided to do) ; to persist in doing ; to make up one's mind

Other writings and readings

JMdict entry 1254190 · frequency rank 31. Source and licence.