Become wider:
— His pupils were dilated.

synonym: distend.

Dutch: uitzetten

Add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing.

synonyms: elaborate, enlarge, expand, expatiate, exposit, expound, flesh out, lucubrate.

Roget 573: be diffuse etc. adj.; run out on, descant, expatiate, enlarge, dilate, amplify, expand, inflate; launch out, branch out; rant.    maunder, prose; harp upon etc. (repeat) 104; dwell on, insist upon.    digress, ramble, battre la campagne [Fr.], beat about the bush, perorate, spin a long yarn, protract; spin out, swell out, draw out; battologize^†.    ... show more

Roget 35: increase, augment, add to, enlarge; dilate etc. (expand) 194; grow, wax, get ahead.    gain strength; advance; run up, shoot up; rise; ascend etc. 305; sprout etc. 194.    aggrandize; raise, exalt; deepen, heighten; strengthen; intensify, enhance, magnify, redouble; aggravate, exaggerate; exasperate, exacerbate; add fuel to the flame, oleum addere camino [Lat.], superadd etc. (add) 37; spread etc. (disperse) 73.    ... show more

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 322: rarefy, expand, dilate, subtilize^†.   

Dutch: uitweiden, verklaren, exponeren, uiteendoen, uiteenzetten