Wax (verb)
To increase gradually in size, number, strength, or intensity: "His love affair with Mrs. Bernstein waxed and waned and waxed again" (C. Hugh Holman).
To speak or write as specified: "[He] warmed to his most favorite of subjects, waxed eloquent, gained in his face a glow of passion" (Paul J. Willis).
Wax (noun)
[Chiefly British] A fit of anger: "All at once you would suddenly find yourself reverting to childish attitudes, flaring up in a wax with some fellow" (Frank O'Connor).