волноваться

1) General subject: be in a fry, be in a stew, be in a twit, be on edge, beat up, billow, create (he is always creating about nothing - он всегда суетится без толку), fidget, flap, fluctuate, fluster, flutter, fret, fume, fuss, grizzle, make a fuss, popple, pother, roll (о море), run high (о море), stew, surge (о толпе), sweat, thrill, throb, to be (all) on edge, to be in a (fine) stew, to be in a flurry, to be in a fry, to be in a twit, undulate, wave (о ниве и т. п.), welter, worrisome, worrit, wouldn't give a curse, agitate oneself, be agitated, be on pins and needles (http://blog.syracuse.com/orangefootball/2011/04/former_syracuse_university_sta_1.html), bother, ferment, get nervous, have kittens, get perturbed

2) American: (smth.) make a time about, (smth.) make a time over

3) Sports: get excited

4) Construction: weave

5) Mathematics: be concerned about

6) Australian slang: be in hot water, get (one's) knickers in a twist, sweat blood

7) Jargon: go for, snap (one's) cap, get it up, feel a knot, futy, graum, raise a dust, steam up

8) Fishery: be choppy, be disturbed, high run (о море)

9) Makarov: be in a flurry, care, fret (о лошади), go off the deep end, rough (о море), to be all on edge, trouble, fret gizzard, fret the gizzard

10) Taboo: have a hair up (one's) ass, rush round like a fart in a colander