n.[C]

1. 低聲；小聲
   They are talking in undertones.

   他們在低聲說話。

2. 淡色，淺色；底彩
3. 潛在的含意
   There is an undertone of regret in what he said.

   他的話中帶有悔意。

4. 市場的潛在傾向

n.

1. a subdued or muted tone of sound or colour.
2. an underlying quality or feeling.