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.
A sound produced by the vocal cords with relatively little restriction of the oral cavity, forming the prominent sound of a syllable.
A letter representing the sound of vowel; in English, the vowels are a, e, i, o, u, and y.
To add vowel points to a consonantal script (e.g. niqqud in Hebrew or harakat in Arabic).