One of the mysteries of the English language finally explained.
The action of overboil.
Boiling over; (of a vessel) overflowing with boiling liquid. Chiefly in extended use: excessively ardent, fervent, or enthusiastic.
Mid 18th century; earliest use found in Walter Harte (d. 1774), writer. From over- + boiling, after overboil or to boil over<br>late 16th century; earliest use found in Thomas Nashe (d. c1601), writer. From over- and boiling, after to boil over.
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