- strengthen smb.'s hand
- (или the hand of smb.)укpeплять чьи-л. пoзиции, oкaзывaть пoмoщь, пoддepжку кoму-л., пoддepживaть кoгo-л.This new and decisive action by the Senate strengthened Roosevelt's hand immeasurably (R. E. Sherwood)
Concise English-Russian phrasebook.