strengthen your hand

strengthen (one's) hand

To give someone the ability to do something better, more forcefully, or more effectively. The law aims to strengthen federal officers' hands when making arrests on suspicion of illegal immigration. The scandal is yet another issue that will strengthen her opponent's hand in the run up to the election.
See also: hand, strengthen
Farlex Dictionary of Idioms.

ˌstrengthen your ˈhand

give you more power to do something or act against somebody/something: The new anti-drug laws will strengthen the hand of the police.
See also: hand, strengthen
Farlex Partner Idioms Dictionary
See also:
  • strengthen
  • strengthen (one's) hand
  • strengthen someone's hand
  • pin (someone or something) against (someone or something)
  • pin against
  • hurl (someone or something) at (someone or something)
  • hurl at
  • champ down on (someone or something)
  • pelt (someone or something) with (something)
  • pelting
References in periodicals archive
This will help you strengthen your hand and wrist muscles.
I named him to strengthen your hands, not to strengthen his.