Give the synonym of the word given below.
Dilate

Dilate means make or become wider, larger, or more open.
Ex: Her eyes dilated with horror.

Meanings of the given words:
Breath - the air is taken into or expelled from the lungs. 
Push - hold and exert force on (something) so as to cause it to move in front of one. 
Widen - to make or become wider. 
Terrible - extremely bad or serious. 
Out of these only Widen shows the meaning of Dilate.