vt.对（服务人员）未给足小费，给…不足的小费
His soft words contained an undertone of warning.
他温和的话中蕴涵着警告之意。
The sobbing voice had an undertone of anger.
啜泣声中隐隐透着愤怒。
"What d'you think?" she asked in an undertone.
“你觉得怎么样？”她小声地问道。
汉字吧hanzi8.com