An auditory tone of low pitch or volume.
A pale colour, or one seen underneath another colour.
A low state of the physical faculties.
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.
To accompany as an undertone.
To say or speak in an undertone.
To present as less important, noticeable or prominent.
Any (typically wooden) musical instrument that produces sound by the player blowing into it, through a reed, or across an opening. Woodwind instruments include the recorder, flute, piccolo, clarinet, oboe, cor anglais and bassoon.