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Phrase(s): a touch of something
1. a mild case of some illness. • I have a touch of the flu and need some more bed rest. 2. a little bit of something, particularly a small helping of food or drink. • A: How about some more? What do you need? B: I’ll have just a touch of that meatloaf if there’s enough to go around.
McGrawhill's American Idioms And Phrasal Verbs