from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Used other than as an idiom: The playing card belonging to the spades suit and featuring one pip.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the ace in the spade suit; sometimes taken as a portent of death
Sorry, no etymologies found.
But the ace of spades in that deck was the most likely possibility: Underwood’s little plot had been discovered and she was in deep, deep trouble.