To consciously cease the ingestion or administration of (a pharmaceutical drug).
To interrupt the continuance of; to put an end to, especially as regards commercial productions; to stop producing, making, or supplying.
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).