Definition of play one's ace in English:

play one's ace

  • Use one’s best resource: deciding to play her ace, Emily showed the letter to Vic
    More example sentences
    • And when men have triumphed in their arguments with women, the women play their ace: they say, as Molly Bloom did, ‘Yes.’
    • But just when it could all fall over at the last hurdle, he plays his ace.
    • When I played my ace - enlisting his family to twist his arm - he only grew more obstinate.
See parent entry: ace

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Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
(in science fiction) navigation in outer space