di ‧ late /daɪˈleɪt/ BrE AmE verb [intransitive and transitive]
[ Date: 1300-1400 ; Language: French ; Origin: dilater , from Latin latus 'wide' ]
if a hollow part of your body dilates or if something dilates it, it becomes wider OPP contract :
dilated pupils
—dilation /daɪˈleɪʃ ə n/ noun [uncountable]
dilate on/upon something phrasal verb formal
to speak or write a lot about something:
He dilated upon their heroism.