To halt something temporarily.
To bring a solid substance, usually in powder form, into suspension in a liquid.
To discontinue or interrupt a function, task, position, or event.
To remove the value of an unused coupon from an air ticket, typically so as to allow continuation of the next sectors' travel.
To hold in an undetermined or undecided state.
To hang freely; underhang.
To support in a liquid, as an insoluble powder, by stirring, to facilitate chemical action.
To debar, or cause to withdraw temporarily, from any privilege, from the execution of an office, from the enjoyment of income, etc.
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).