Become wider.

synonym: dilate.

Roget 325: stretch, flex, extend, distend, be elastic etc. adj.; bounce, spring back etc. (recoil) 277.   

Roget 194: become larger etc. (large) etc. 192; expand, widen, enlarge, extend, grow, increase, incrassate^†, swell, gather; fill out; deploy, take open order, dilate, stretch, distend, spread; mantle, wax; grow up, spring up; bud, bourgeon [Fr.], shoot, sprout, germinate, put forth, vegetate, pullulate, open, burst forth; gain flesh, gather flesh; outgrow; spread like wildfire, overrun.    be larger than; surpass etc. (be superior) 33.    render larger etc. (large) etc. 192; expand, spread, extend, aggrandize, distend, develop, amplify, spread out, widen, magnify, rarefy, inflate, puff, blow up, stuff, pad, cram; exaggerate; fatten.    ... show more

Roget 200: be long etc. adj.; stretch out, sprawl; extend to, reach to, stretch to; make a long arm, drag its slow length along.   " render long etc. adj.; lengthen, extend, elongate; stretch; prolong, produce, protract; let out, draw out, spin out^†; drawl.    enfilade, look along, view in perspective.    distend (expand) 194.    ... show more

Dutch: uitzetten

Cause to expand as it by internal pressure.

Swell from or as if from internal pressure.