To remain in office, possession, etc., beyond a certain date.
(Of a resource) To support or sustain someone for a limited period.
to save, delay
To request or accept a rain check (an agreement from a merchant to honor a special offer, temporarily unavailable, after the expiration date).
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.