expression, ichidan verb
put a lot of effort into; take a strong interest in; put great emphasis on; show zeal for
Idiomatic expression literally meaning 'to put a muscle knot into something', used when someone exerts great effort, enthusiasm, or emphasis on a task or cause.
彼は仕事に力こぶを入れている。
He puts a lot of effort into his work.
政
The government has started to put great emphasis on educational reform.