dilates is a form of:

Dilate



verb
1.
(INTRANSITIVE) រីក, ពង្រីក
2.
(TRANSITIVE) ធ្វើឱ្យរីក, ប៉ោង
Example: The pupils of your eyes dilate when, you enter a dark room.
1.
augment, broaden, increase, widen
1.
abridge, contract, diminish, restrict, shrink