To make a arrangment to do a said activity at another time.

First used when baseball games were rained out and fans were issued vouchers that allowed them to return and watch another game.

A jack off buddy (from 'cum' /'come', meaning 'semen', and 'companion'); a friend that you get together with for sessions of solo or mutual masturbation
Variant of: cumpanion (from 'companion' & 'cum'); jack off buddy & wank bud & JO buddy
Similar to: fuck buddy

A promise that an unaccepted offer will be renewed in the future.

This term comes from baseball, where in the 1880s it became the practice to offer paying spectators a rain check entitling them to future admission for a game that was postponed or ended early owing to bad weather. By the early 1900s the term was transferred to tickets for other kinds of entertainment, and later to a coupon entitling a customer to buy, at a later date and at the same price, a sale item temporarily out of stock.

When someone is not interested in hanging out, but doesn’t wanna be a dick, so they ask for a raincheck.

A promise that an unaccepted offer will be renewed in the future. 7 days at most

A term that makes a cancellation seem less offensive.

when someone is unable of pursuing prior plans do to an unexpected obstacle such as time consuming problems or an emergency.