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Phrase(s): water something down
1. to dilute something. • Who watered the orange juice down? • Jim watered down the orange juice. 2. to water something thoroughly. • Will you water the lawn down tonight? • Water down the lawn this evening so it will grow tomorrow. 3. Fig. to reduce the effectiveness or force of something. (Fig. on Q.) • Please don’t water my declaration down. • The new laws watered down the power of the president.
McGrawhill's American Idioms And Phrasal Verbs