The Collaborative International Dictionary of English v.0.48:
Gain \Gain\, v. i.
To have or receive advantage or profit; to acquire gain; to
grow rich; to advance in interest, health, or happiness; to
make progress; as, the sick man gains daily.
Thou hast greedily gained of thy neighbors by
extortion. --Ezek. xxii.
Gaining twist, in rifled firearms, a twist of the grooves,
which increases regularly from the breech to the muzzle.
To gain on or To gain upon.
(a) To encroach on; as, the ocean gains on the land.
(b) To obtain influence with.
(c) To win ground upon; to move faster than, as in a race or
(d) To get the better of; to have the advantage of.
The English have not only gained upon the Venetians
in the Levant, but have their cloth in Venice
My good behavior had so far gained on the emperor,
that I began to conceive hopes of liberty. --Swift.