tacityoudaoicibaDictYouDict[tacit 词源字典]
tacit: [17] Tacit was adapted from Latin tacitus, the past participle of tacēre ‘be silent’. Another derivative of this was Latin taciturnus, from which English gets taciturn [18]; and tacēre also lies behind English reticent.
=> reticent, taciturn[tacit etymology, tacit origin, 英语词源]
tacit (adj.)youdaoicibaDictYouDict
c. 1600, "silent, unspoken," from French tacite and directly from Latin tacitus "that is passed over in silence, done without words, assumed as a matter of course, silent," past participle of tacere "be silent, not speak," from suffixed form of PIE root *tak- "to be silent" (cognates: Gothic þahan, Old Norse þegja "to be silent," Old Norse þagna "to grow dumb," Old Saxon thagian, Old High German dagen "to be silent"). The musical instruction tacet is the 3rd person present singular of the Latin verb. Related: Tacitly.