howl - a loud sustained noise resembling the cry of a hound; "the howl of the wind made him restless"

let loose, let out, utter, emit - express audibly; utter sounds (not necessarily words); "She let out a big heavy sigh"; "He uttered strange sounds that nobody could understand"

acknowledge, admit - declare to be true or admit the existence or reality or truth of; "He admitted his errors"; "She acknowledged that she might have forgotten"