v. t. [ Pref. de- down + L. flare, flatus to blow. ] To reduce from an inflated condition; used literally and metaphorically; as, to deflate a tire; to deflate expectations. [ 1913 Webster +PJC ]
adj. 1. brought low in spirit. left us fatigued and deflated spiritually Syn. -- chapfallen, chopfallen, crestfallen. [ WordNet 1.5 ]