1. To put forth all of one's energy and effort into something; to give it one's best effort; to try as hard as one can.
2. Words of encouragement.
The statistics test was really difficult, but I gave it my all anyway and ended up getting an A!

You don't have to be an athlete to run a mile -- just give it your all and you can do it!
by Moosh101 September 19, 2013
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