A skeleton key (also master key or pass key) is a key that can open all of the locks in a set.
ʌ WORD_BOUNDARY s k ɛ l ɪ t ə n WORD_BOUNDARY k iː WORD_BOUNDARY ɔ l s oʊ WORD_BOUNDARY m æ s t ə ɹ WORD_BOUNDARY k iː WORD_BOUNDARY ɔ ɹ WORD_BOUNDARY p æ s WORD_BOUNDARY k iː WORD_BOUNDARY ɪ z WORD_BOUNDARY ʌ WORD_BOUNDARY k iː WORD_BOUNDARY ð æ t WORD_BOUNDARY k æ n WORD_BOUNDARY oʊ p ə n WORD_BOUNDARY ɔ l WORD_BOUNDARY ʌ v ð ə WORD_BOUNDARY l ɑ k s WORD_BOUNDARY ɪ n WORD_BOUNDARY ʌ WORD_BOUNDARY s ɛ t WORD_BOUNDARY