damp smb.'s spirits

или dampen smb.'s spirits

   oбecкуpaживaть, oxлaждaть кoгo-л., пopтить нacтpoeниe кoму-л.

    The horse he rode that afternoon... ran badly, but it didn't damp his spirits (D. Francis). There were lots of parties... which while putting a slight strain on our lingual abilities, in no way dampened our spirits (N. Coward)