A fork of Rural Dictionary
To suspect, assume or have a reasonable theory about something.
I reckon to be finished with all the packing by 3:00 pm.
V. To believe.
V. To contend with, to compete against.
"I reckon that there are twenty four hours in a day. Anyone think I'm wrong?"
"The man was quite a force to be reckoned with, as he had many good friends in the business."
The time when you are held accountable for your actions - good or bad - and thereafter receive the punishment or reward for those actions.
In other words, what goes around comes around eventually.
"I can't stand her! Let me at her!"
"Nah don't trip, she'll have her day of reckoning "
a settlement of accounts. retribution for a submissive's tortuous wrongdoings levied in a punitive way.
My sub knew her day of reckoning would soon come after having acted like a terrible little cock-hungry brat.