noun An implicit message perceived subtly alongside, but not detracting noticeably from, the explicit message conveyed in or by a book, film, speech or similar (contrast with overtone); an undercurrent.
noun A pale colour, or one seen underneath another colour.
noun A low state of the physical faculties.
verb To accompany as an undertone.
verb To say or speak in an undertone.
verb To present as less important, noticeable or prominent.