draindrain1 /dreɪn/ ●●○ verb 1 a)[transitive] to make the water or liquid in something flow away: The swimming pool is drained and cleaned every winter. Brad drained all the oil from the engine. b)[intransitive] if something drains, the liquid in it or on it flows away: Let the pasta drain well. c)[intransitive] if a liquid drains, it flows away: The bath water slowly drained away.2[transitive] to use up all of your energy, making you feel very tired: Working with children all day really drains you.3[intransitive] if the color drains from your face, you suddenly become pale4[transitive] to drink all the liquid in a glass, cup, etc.: Lori quickly drained her cup.