THREATENING n.
a. & n. from Threaten, v. -- Threat"en*ing*ly, adv. Threatening letters (Law), letters containing threats, especially those designed to extort money, or to obtain other property, by menaces; blackmailing letters.
THREE-COAT a.
Having or consisting of three coats; -- applied to plastering which consists of pricking-up, floating, and a finishing coat; or, as called in the United States, a scratch coat, browning, and finishing coat.