undertone

kuiskaus

sävy

pohjasävy an auditory tone of low pitch or volume
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
a pale colour, or one seen underneath another colour
To accompany as an undertone.
1941, (w), (w), Chapter 1,http://www.gutenberg.net.au/ebooks01/0100131.txt

The Missionary's address rolled on in choppy Chinook, undertoned by a gentle voice from the back of the room which told Tanook in pure Indian words what he was to do.

Undertoning the howling siren I was aware of a distant swish, like that of a hurricane’s forerunning wind through palm fronds.

Evan paid no attention to him, and answered none of his hasty undertoned questions.

At first, when the net was being prepared, those children of the forest had merely stood by and looked on with curiosity. When Blondin and his men rowed out from the shore, letting the net drop off the stern of our boat as they went, they indulged in a few guesses and undertoned remarks.

“He handles that pallet like it was a mule,” McCoy undertoned, passing Mason. Mason grinned and fell in behind.

“How come there’s never any birds in cemeteries?” Skelote undertoned. “Squirrels, rabbits, but no birds.”

Men rarely make this mistake, their habitual blunder being to undertone everything, to make too light of Julia's new frock, and Johnnie's symptoms of measles, and the way they waste things down stairs.

It’s hard enough to separate the geeks from the creeps at your average Anime con (it’s more of a Venn Diagram than an either/or, really). The task becomes even more difficult at Arisia, where the sexual undertones are … not particularly undertoned.