Definitions:
of less than average height from top to bottom or to the top from the ground

below average in amount, extent, or intensity

ranking below other people or things in importance or class

(of a sound or voice) not loud or high

depressed or lacking in energy

a low point, level, or figure

a difficult time in a person's life

in or into a low position or state

in a low voice or at a low pitch

(of a cow) make a characteristic deep sound

a sound made by cattle; a moo.