Also found in: Dictionary.
Related to reckon in: A Force to Be Reckoned With
To include or figure some number or people or things into a greater sum or calculation. A noun or pronoun can be used between "reckon" and "in." Be sure you reckon Janet's husband and kids in your numbers when you're counting everyone who's coming to the reception. We haven't reckoned in these sales yet, so the figures for this past financial quarter are a little off.
See also: reckon
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.