buckle down

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buckle down (third-person singular simple present buckles down, present participle buckling down, simple past and past participle buckled down)

1. (idiomatic) To put forth the needed effort; to focus; become serious; apply oneself (e.g. to work or study).

   If he would buckle down and do his homework, he could be an excellent student.

• buckle to
• buckle up
• hunker down
• knuckle down