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To eat at one's home, as opposed to eating at a restaurant ("eating out"). Neither of us felt like going out, so we ate in tonight.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
eat in (to something)
to erode into something; to etch something. The acidic water ate into the rocks on the shore. The acid ate in and weakened the structure.
to eat a meal at home. I really don't want to eat in tonight. Let's eat in. I'm tired.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Have a meal at home, as in Are we eating in tonight? [Colloquial; second half of 1900s] Also see eat out, def. 1.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
To eat at home, rather than in a restaurant: It's raining outside, so let's eat in tonight.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.