(1):
(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.
(2):
(n.) A shrill sound.
(3):
(v. t.) To utter or express in a shrill tone; to cause to make a shrill sound.
(4):
(v. i.) To utter an acute, piercing sound; to sound with a sharp, shrill tone; to become shrill.