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Từ điển Oxford Advanced Learner 8th
up and down
ˌup and ˈdown idiom 1. moving upwards and downwards • The boat bobbed up and down on the water. 2. in one direction and then in the opposite direction • She was pacing up and down in front of her desk. 3. sometimes good and sometimes bad • My relationship with him was up and down. 4. (NAmE, informal)if you swear up and down that sth is true, you say that it is definitely true Main entry: ↑upidiom
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