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English definition of “top sth up”

top sth up

(LIQUID) UK (US top sth off) phrasal verb with top     /tɒp/ US  /tɑːp/ verb (-pp-)
to add liquid in order to fill to the top a container that is already partly full: Would you like me to top up your drink? Mix together some lemon juice and sugar, then top it up with water.Filling and completingMovement of liquids
(Definition of top sth up (LIQUID) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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