ambush, appear unexpectedly, assail, assault, astonish, attack, be unexpected, blitz, bob up, bounce, bound, buck, buckjump, bushwhack, capriole, catch at, catch off-guard, catch unawares, clear, come at, come down on, come from behind, come unawares, come upon, come upon unexpectedly, crack down on, creep up on, curvet, descend on, descend upon, dive, do the unexpected, drop, drop in on, fall, fall on, fall upon, fasten upon, flash upon one, gang up on, go at, go for, harry, have at, hippety-hop, hit, hit like lightning, hop, hurdle, jump, jump at, jump over, land on, lay at, lay hands on, lay into, leap, leap over, leapfrog, light into, mug, negotiate, nose-dive, overjump, overleap, overskip, parachute, pitch, pitch into, plop, plummet, plump, plunge, plunk, pop up, pounce, pounce on, pound, pull up short, sail into, scramble for, seize on, set on, set upon, ski jump, skin-dive, skip, sky-dive, snap at, snatch at, sound, spring, spring a surprise, spring upon, start, start aside, start up, steeplechase, stoop, strike, surprise, swoop, swoop down, swoop down on, swoop down upon, take a header, take by surprise, take short, take the offensive, take unawares, turn up, updive, upleap, upspring, vault, wade into