本腰 ほんごし れる
hongoshio ireru

Ichidan Verb
Idiomatic Expression

1. to set about in earnest; to make a strenuous effort; to put one's back into (doing)

おれ あわてて さが もの本腰 ほんごし はじめた。
orewa awatete sagashimononi hongoshio irehajimeta.
I hurriedly started searching in earnest.
Other forms: