1. A magic spell.
2. A mischevious trick; a sham.
(of an effect) produced by black magic.
Etymology: Scottish, but exact origin unknown.
Not to be confused with caltrop, a device with four spikes which is sometimes used as a hazardm to puncture tires.
Gamers might be familiar with this word, in reference to a self-replacing spell or card.
In Magic: The Gathering, it's a spell that allows you to draw another card as part of its effect.
I play Dominion, which uses the term in reference to action cards that allow one to draw another card and play another action.