tac·it /ˈtæsət/
 (a.)沈默寡言的,心照不宣的,緘默的
 Tac·it a.  Done or made in silence; implied, but not expressed; silent; as, tacit consent is consent by silence, or by not interposing an objection. -- Tac*it*ly, adv.
    The tacit and secret theft of abusing our brother in civil contracts.   --Jer. Taylor.
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 tacit
      adj : indicated by necessary connotation though not expressed
            directly; "gave silent consent"; "a tacit agreement";
            "the understood provisos of a custody agreement" [syn:
            implied, silent, understood]