telltale
adjective [ before noun ] uk/ˈtel.teɪl/ us/ˈtel.teɪl/
泄露秘密的
allowing a secret to become known
She found lipstick on his shirts - the telltale sign that he was having an affair. 她发现他的衬衫上有口红印——这可是他有外遇的迹象。
Compare: giveaway noun (TRUTH) tellingrevealing
telltale
noun [ C ] UK disapproving uk/ˈtel.teɪl/ us/ˈtel.teɪl/ (US tattletale)
告密者，打小报告的人（尤指向老师告状的小孩）
a person, especially a child, who secretly tells someone in authority, especially a teacher, that someone else has done something bad, often in order to cause trouble
Synonym: blabbermouth