力ちからを入いれる

expression, ichidan verb

put effort into; put strength into; strain

Used when focusing physical or mental effort on a task, body part, or object. Often implies a deliberate, concentrated application of force or energy.

See also: 力が入る

• 彼かれは腕うでに力ちからを入いれて重おもい箱はこを持もち上あげた。

  He put strength into his arms and lifted the heavy box.