To set aside; to quit or postpone.
To place on a shelf.
To furnish with shelves.
To slope; to incline; to form into shelves.
To have sex with.
To take (drugs) by anal or vaginal insertion.
A rocky ledge or shelf.
In social interactions, to request a deferral of an invitation. To "take a rain check" is a polite way to turn down an engagement, usually with the implication that one is simply postponing it and another time might be acceptable.
To request or accept a rain check (an agreement from a merchant to honor a special offer, temporarily unavailable, after the expiration date).