snack on
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snack on (something)
To eat small amounts of something as a snack. I love watching the birds and squirrels come up to the feeder throughout the day to snack on seeds. I've been snacking on that roast ham all day, so I'm not terribly hungry.
snack on
v.
To eat something as a snack: One way to lose weight is to snack on carrots instead of junk food.