WordNet (r) 3.0 (2006):
buoy up v 1: become more cheerful; "after a glass of wine, he lightened up a bit" [syn: lighten, lighten up, buoy up] 2: make more cheerful; "the conversation lightened me up a bit" [syn: lighten, lighten up, buoy up] [ant: weigh down, weigh on] 3: keep afloat; "The life vest buoyed him up" [syn: buoy, buoy up]