Trump In
Definition
To play a trump card when a fail suit was led (because you have none of that fail suit). A way to win tricks you otherwise couldn't.
Trump In in play
To trump in is to play a trump when a fail suit is led because you are void in that suit - a way to steal a trick you otherwise could not contest. Creating voids, through burying or short-suit leads, is what sets up trumping in. Be careful trumping in with a low trump from an early seat, since a player behind you can overtrump it.
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Related Terms
Trump
The powerful suit that beats all fail cards. In Sheepshead: all Queens, all Jacks, and all Diamonds are trump (14 cards total).
Void
Having no cards in a particular suit. Being void in a fail suit is valuable because you can trump in when it's led.
Fail (Fail Suit)
Any suit that is not trump. In Sheepshead, Clubs, Spades, and Hearts (without their Queens and Jacks) are fail suits.