full as a tick
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Related to full as a tick: tight as a tick
(as) full as a tick
Having consumed large quantities of food or drink. A reference to a tick that is engorged with blood. There was so much delicious food at the banquet that I'm just full as a tick now.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
*full as a tick
very full of food or drink. (Alludes to a tick that has filled itself full of blood. See also tight as a tick. *Also: as ~.) Little Billy ate and ate until he was as full as a tick. Our cat drank the cream until he became full as a tick.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.