1. To jut out or project in space; SYN. protrude, jut out, project.
2. When something sticks out, it extends from what it is attached to.
3. When a characteristic or feature of something sticks out, that feature is very noticeable.

1. When you stick something out, you extend it outward.
2. When you stick out an unpleasant or difficult experience, you continue with it until it is over, rather than quit.