THESAURUS
gain upon
accost, advance, approach, appropinquate, approximate, bear down on, bear down upon, bear up, catch up with, close, close in, close with, come, come closer, come forward, come near, come on, come up, come up to, come up with, confront, draw near, draw nigh, encounter, gain on, lap, leave behind, leave standing, narrow the gap, near, outpace, outrun, outsail, outstrip, overhaul, overtake, pass, proximate, sidle up to, step up
ROGET THESAURUS
gain upon
Approach
VB
approach, approximate, appropinquate, near, get near, go near, draw near, come to close quarters, come near, move towards, set in towards, drift, make up to,
gain upon, pursue, tread on the heels of, bear up, make the land, hug the shore, hug the land.