overtone
noun [ C ] uk/ˈəʊ.və.təʊn/ us/ˈoʊ.vɚ.toʊn/
[ usually plural ]暗示;弦外之音，言外之意
something that is suggested, but is not clearly stated
The concert was supposed to be a charity event but it had strong political overtones. 这场音乐会原是为慈善事业筹款的，但却带有浓厚的政治色彩。
There was an overtone of regret in his farewell speech. 他的告别演说中流露出遗憾之意。
physics, music specialized泛音
a frequency of a sound that is higher than the fundamental (= the lowest normal frequency)