Plural for an underlying quality or feeling
“For all that written correspondence can manage, a subtle undertone and feeling is probably the hardest to achieve.”
Plural for a subdued or muted tone of sound or colour
“She whispered, but Will murmured in an undertone for her to be quiet.”
Plural for a small amount of something
Plural for process to make softer
Plural for the spectral composition of visible light, or a subset thereof
Plural for the quiet or subdued expression of a particular feeling by a group of people
Plural for a slightly different variety of something
Plural for a remark or passage, especially in a play that is intended to be heard only by the audience
De-emphasize
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