Make sharp or sharper.

Roget 173: be violent etc. adj.; run high; ferment, effervesce; romp, rampage, go on a rampage; run wild, run amuck, run riot; break the peace; rush, tear; rush headlong, rush foremost; raise a storm, make a riot; rough house [Slang]; riot, storm; wreak, bear down, ride roughshod, out Herod, Herod; spread like wildfire (person). [shout or act in anger at something], explode, make a row, kick up a row; boil, boil over; fume, foam, come on like a lion, bluster, rage, roar, fly off the handle, go bananas, go ape, blow one's top, blow one's cool, flip one's lid, hit the ceiling, hit the roof; fly into a rage (anger) 900.    break out, fly out, burst out; bounce, explode, go off, displode^†, fly, detonate, thunder, blow up, crump^†, flash, flare, burst; shock, strain; break open, force open, prize open.    render violent etc. adj.; sharpen, stir up, quicken, excite, incite, annoy, urge, lash, stimulate, turn on; irritate, inflame, kindle, suscitate^†, foment; accelerate, aggravate, exasperate, exacerbate, convulse, infuriate, madden, lash into fury; fan the flame; add fuel to the flame, pour oil on the fire, oleum addere camino [Lat.].    explode; let fly, fly off; discharge, detonate, set off, detonize^†, fulminate.    ... show more

Roget 824: excite, affect, touch, move, impress, strike, interest, animate, inspire, impassion, smite, infect; stir the blood, fire the blood, warm the blood; set astir; wake, awake, awaken; call forth; evoke, provoke; raise up, summon up, call up, wake up, blow up, get up, light up; raise; get up the steam, rouse, arouse, stir; fire, kindle, enkindle, apply the torch, set on fire, inflame.    stimulate; exsuscitate^†; inspirit; spirit up, stir up, work up, pique; infuse life into, give new life to; bring new blood, introduce new blood; quicken; sharpen, whet; work upon etc. (incite) 615; hurry on, give a fillip, put on one's mettle.    fan the fire, fan the flame; blow the coals, stir the embers; fan into a flame; foster, heat, warm, foment, raise to a fever heat; keep up, keep the pot boiling; revive, rekindle; rake up, rip up.    stir the feelings, play on the feelings, come home to the feelings; touch a string, touch a chord, touch the soul, touch the heart; go to one's heart, penetrate, pierce, go through one, touch to the quick; possess the soul, pervade the soul, penetrate the soul, imbrue the soul, absorb the soul, affect the soul, disturb the soul.    absorb, rivet the attention; sink into the mind, sink into the heart; prey on the mind, distract; intoxicate; overwhelm, overpower; bouleverser [Fr.], upset, turn one's head.    fascinate; enrapture etc. (give pleasure) 829.    agitate, perturb, ruffle, fluster, shake, disturb, startle, shock, stagger; give one a shock, give one a turn; strike all of a heap; stun, astound, electrify, galvanize, petrify.    irritate, sting; cut to the heart, cut to the quick; try one's temper; fool to the top of one's bent, pique; infuriate, madden, make one's blood boil; lash into fury etc. (wrath) 900.    be excited etc. adj.; flush up, flare up; catch the infection; thrill etc. (feel) 821; mantle; work oneself up; seethe, boil, simmer, foam, fume, flame, rage, rave; run mad etc. (passion) 825.    ... show more

Roget 171: give energy etc. n.; energize, stimulate, kindle, excite, exert; sharpen, intensify; inflame etc. (render violent) 173; wind up etc. (strengthen) 159.    strike home, into home, hard home; make an impression.    ... show more

Roget 375: be sensible of etc. adj.; feel, perceive.    render sensible etc. adj.; sharpen, cultivate, tutor.    cause sensation, impress; excite an impression, produce an impression.    ... show more

Make crisp or more crisp and precise.

Become sharp or sharper.

Put (an image) into focus.

synonyms: focalise, focalize, focus.

Dutch: focussen

Make (images or sounds) sharp or sharper.

Raise the pitch of (musical notes).

Give a point to.

synonyms: point, taper.

Roget 253: be sharp etc. adj.; taper to a point; bristle with.    render sharp etc. adj.; sharpen, point, aculeate, whet, barb, spiculate^†, set, strop, grind; chip (flint). cut etc. (sunder) 44.    ... show more

Make (one's senses) more acute:
— This drug will sharpen your vision.

synonym: heighten.