Froth \Froth\, v. t. [imp. & p. p. {Frothed}; p. pr. & vb. n.. {Frothing}.] 1. To cause to foam. 2. To spit, vent, or eject, as froth. He . . . froths treason at his mouth. --Dryden. Is your spleen frothed out, or have ye more? --Tennyson. 3. To cover with froth; as, a horse froths his chain.