to make wider or larger; cause to expand.

Archaic . to describe or develop at length.

to spread out; expand.

to speak or write at length; expatiate (often fol. by on or upon ).

verb

compress , constrict , contract , lessen , reduce

verb

amplify , augment , be profuse , be prolix , broaden , develop , distend , enlarge , expand , expatiate , expound , extend , increase , inflate , lengthen , prolong , protract , puff out , spin off , swell , labor , stretch , widen