Low

Low is a feature which characterizes sounds that are produced by lowering the body of the tongue from neutral position.

Example

in English [a] is [+low].

Link

Utrecht Lexicon of Linguistics

References

• Chomsky, N. and M. Halle 1968. The Sound Pattern of English, Harper and Row, New York.
• Halle, M. & G. Clements 1983. Problem Book in Phonology, Cambridge, MA: MIT Press.