/eb ||; ɛb/noun [sing] the ebb the time when sea water flows away from the land 退潮 The movement of sea water twice a day is called the tide. 海水每天的两次运动叫做潮 (tide)。 ☞Look at high tide. 参看 high tide。 the ebb and flow (of sth) (used about a situation, noise, feeling, etc) a regular increase and decrease in the progress or strength of sth （指情况、噪音、感觉等）时起时落