Meaning of 本腰 in Japanese

Definition of 本腰

ほんごし(hongoshi) 【本腰】

(n) strenuous effort; earnestness; seriousness
さて、本腰を入れてまじめな話をしよう。
Now let us get down to a serious talk.

ほんごしをいれる(hongoshiwoireru) 【本腰を入れる】

(exp, v1) to set about in earnest; to put one's back into something
俺は慌てて探し物に本腰を入れ始めた。
I hurriedly started searching in earnest.

さて、本腰ほんごしを入れてまじめなまじめ話をしよう。

Now let us get down to a serious talk.