B1[I or T]to put something or someone in a place where they cannot be seen or found, or to put yourself somewhere where you cannot be seen or found: She used to hide her diary under her pillow.A kilo of heroin was found hidden inside the lining of the suitcase.I like wearing sunglasses - I feel I can hide behind them.Hiding and disguising›[T]to prevent something from being seen: He tries to hide his bald patch by sweeping his hair over to one side.Hiding and disguisingB1[T]to not show an emotion: She tried to hide her disappointment at not getting the promotion.Hiding and disguisingB1[T]If you hide information from someone, you do not allow that person to know it: I feel sure there's something about her past that she's trying to hide from me.Secrecy and privacy