feast on

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feast (up)on (something)

To eat large quantities of something, usually with pleasure. The kids feasted on birthday cake and returned to us with frosting-stained faces.
See also: feast

feast (up)on something

to eat a great deal of something; to eat a feast built around something in particular. We will feast upon turkey for weeks. We feasted on the fish Harry had caught.
See also: feast, on