Augment

v. t. [imp. & p. p. AUGMENTED; p. pr. & vb. n. AUGMENTING.] [Fr. augmenter, Pr. aumentar, Lat. augmentare, from augmentum, an increase, from augere, to increase, kindred with Gr. αὐξείν, αὐξάνειν, root αὐξ, Eng. wax, Ger. wachsen.] To enlarge or increase in size or extent, amount, degree, or magnitude; to swell; to make bigger; as, to augment an army by re-enforcements; rain augments a stream; impatience augments an evil.

But their spite still serves His glory to augment. Milton.

v. i. To increase; to grow larger; as, a stream augments by rain.