Pronunciation: (im-pâr'), [key]
to make or cause to become worse; diminish in ability, value, excellence, etc.; weaken or damage: to impair one's health; to impair negotiations.
to grow or become worse; lessen.
Pronunciation: (an-per'), [key]
noting any odd number, esp. in roulette. Cf. pair.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.