aposiopesis (n.)youdaoicibaDictYouDict[aposiopesis 词源字典]
rhetorical artifice wherein the speaker suddenly breaks off in the middle of a sentence, 1570s, from Latin, from Greek aposiopesis "a becoming silent," also as a rhetorical figure, from apo- (see apo-) + siope "silence."[aposiopesis etymology, aposiopesis origin, 英语词源]