Overtone vs. Undertone: What's the Difference?

Overtone and Undertone Definitions
Overtone
An ulterior, usually implicit meaning or quality; an implication or a hint
An overtone of anger barely masked.
Praise with overtones of envy.
Undertone
An underlying or implied tendency or meaning; an undercurrent.
Overtone
See harmonic.
Undertone
A tone of low pitch or volume, especially of spoken sound.
Overtone
A tone whose frequency is an integer multiple of another; a member of the harmonic series.
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Undertone
A pale or subdued color.
Overtone
An implicit message (in a film, book, verbal discussion or similar) perceived as overwhelming the explicit message.
Undertone
A color applied under or seen through another color.
Overtone
(transitive) To give an overtone to.
Undertone
An auditory tone of low pitch or volume.
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Overtone
One of the harmonics faintly heard with and at a higher frequency than a fundamental tone as it dies away, produced by some aliquot portion of the vibrating sting or column of air which yields the fundamental tone; one of the natural harmonic scale of tones, as the octave, twelfth, fifteenth, etc.; an aliquot or "partial" tone; a harmonic. See Harmonic, and Tone.
Undertone
An implicit message perceived subtly alongside, but not detracting noticeably from, the explicit message conveyed in or by a book, film, verbal dialogue or similar (contrast with overtone); an undercurrent.
Overtone
(usually plural) an ulterior implicit meaning or quality;
Overtones of despair
Undertone
A pale colour, or one seen underneath another colour.
Overtone
A harmonic with a frequency that is a multiple of the fundamental frequency
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Undertone
A low state of the physical faculties.
Undertone
To accompany as an undertone.
Undertone
To say or speak in an undertone.
Undertone
To present as less important, noticeable or prominent.
Undertone
A low or subdued tone or utterance; a tone less loud than usual.
Undertone
A quiet or hushed tone of voice;
Spoke in undertones
Undertone
Subdued emotional quality underlying an utterance; implicit meaning
Undertone
A pale or subdued color