1 : to be easily seen or noticed
His bright tie made him stand out (in the crowd).
The trees' red leaves stood out against the gray sky.
2 : to be better or more important than the other people or things in a group in a way that is easily seen or noticed
As a student, she stood out above/from the rest.
Only one contestant really stands out [=sticks out] in my mind.
Two facts stand out from her testimony.
His performance really stood out.
3 : to extend out from a surface
The hat made her ears stand out [=stick out].