undertone
US
UK undertone n: (low voice)
SC 低声 dī shēng
TC 低聲
TC 低聲
SC 低语 dī shēng，dī yǔ
SC 低语 dī shēng，dī yǔ
The two men spoke in an undertone so that nobody would overhear them.
undertone n: figurative (underlying meaning)
SC 潜在的含义 qián zài de hán yì
SC 弦外之音 qián zài de hán yì，xián wài zhī yīn
The teacher's words had a threatening undertone.