Stamps (OUT) is a term used to describe the process of cancelling postage stamps. The term is derived from the phrase 'stamp OUT', which means to put an end to something. The crossword solutions for this term are ENDS (4 letters), SNUFFS (6 letters), and SCOTCHES (8 letters). ENDS refers to the act of ending or stopping something, SNUFFS is a reference to snuffing OUT a flame, and SCOTCHES is a reference to the Scotch tape used to affix stamps to envelopes.