1
general::
Phrase(s): reckon with someone or something
to deal with someone or something; to cope with someone or something. • I have to reckon with the troublesome Mr. Johnson this afternoon. • Mary knew just exactly how she had to reckon with the bill collector.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
1. Take into account, be prepared for, as in The third-party movement is a force to be reckoned with during the primaries. This usage was first recorded in 1885. 2. Deal with, as in Your lost wallet isn't the only problem we have to reckon with. Also see TAKE INTO ACCOUNT.
American Heritage Idioms