1. (v. i.) To beat, or pulsate, with more than usual force or rapidity; to beat in consequence of agitation; to palpitate; -- said of the heart, pulse, etc.

2. (n.) A beat, or strong pulsation, as of the heart and arteries; a violent beating; a palpitation:

ache agonize ail anguish arrhythmia bar beat barrage beat beat a ruffle beat a tattoo beating bicker blanch blench dance didder disquiet disquietude dithers downbeat drum drum music drumbeat drumfire drumming feel pain feel the pangs fidget fidgetiness fidgets flap flick flicker flip flip out flit flitter flop flutter freak out on get high on glow go pitapat grimace gutter have a misery have the fidgets have the shakes heartbeat heartthrob heave heaving hurt inquietude jerk offbeat palpitate palpitation pant panting paradiddle patter pitapat pitter-patter pound pounding pulsate pulsation pulse quake quaking quaver quavering quiver quivering rat-a-tat rat-tat rat-tat-tat rataplan rattattoo resonate restlessness rhythm roll rub-a-dub ruff ruffle shake shakes shaking shiver shivers shoot shrink shudder slat smart sound a tattoo spatter splatter splutter sputter squirm staccato suffer swell swell with emotion tat-tat tattoo tempo thrill thrill to throbbing thrum thump thumping tick ticktock tingle tingle with excitement tom-tom toss toss and turn tremble trembling tremor trepidation trepidity tumble turn on to twinge twist and turn twitch twitter unrest upbeat vibrate wave waver wiggle wince wriggle writhe