v. i. - Acute; sharp; piercing; having or emitting a sharp, piercing tone or sound; -- said of a sound, or of that which produces a sound.
n. - A shrill sound.
v. i. - To utter an acute, piercing sound; to sound with a sharp, shrill tone; to become shrill.
v. t. - To utter or express in a shrill tone; to cause to make a shrill sound.