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Phrase(s): linger over something
1. to take too much time or idle over something, such as a meal, a cup of coffee, etc. • I could linger over coffee all morning, given the chance. • Don’t linger over your soup. It will get cold. 2. to dawdle over the doing of something. • You shouldn’t linger over eating your dinner. • It would be best not to linger over making up your mind.
McGrawhill's American Idioms And Phrasal Verbs