to attempt to get something from someone by behaving dishonestly or by tricking them
Example: 'No, I meant it was the last dress I would try on in this shop.
to attempt to start a sexual relationship with someone
Example: He'd seen her try on and discard enough of them in the last few weeks.
to behave badly in order to see how annoying or unreasonable you can be before someone becomes angry
Example: If you think that game’s easy, try this one on for size.
to put on a piece of clothing in order to see how it looks and whether it fits
Example: Jessica asked, stepping out from behind the curtain in the dark red dress Sherrie had insisted she try on.
to try on clothes to see if they fit
Example: She decided to try on the necklace and was about to clasp it around her neck, when Wanna snatched it away.
to try something to see if it is suitable
Example: They always try it on with a new teacher.