Overboil \O`ver*boil"\, v. i. To boil over or unduly. Nor is discontent to keep the mind Deep in its fountain, lest it overboil In the hot throng. --Byron.
overboil v 1: overflow or cause to overflow while boiling; "The milk is boiling over" [syn: {boil over}] 2: boil excessively; "The peas are overboiled"