Entry 2 senses · 2 variants Webster, 1913 Upbreak /(ŭp*brāk")/ · Up·break · IPA v. i. n. 01 v. i. To break upwards; to force away or passage to the surface. 1. To break upwards; to force away or passage to the surface. 02 n. A breaking upward or bursting forth; an upburst. 1. A breaking upward or bursting forth; an upburst.