WordNet (r) 3.0 (2006):
let down v 1: move something or somebody to a lower position; "take down the vase from the shelf" [syn: lower, take down, let down, get down, bring down] [ant: bring up, elevate, get up, lift, raise] 2: fail to meet the hopes or expectations of; "Her boyfriend let her down when he did not propose marriage" [syn: disappoint, let down]