1. To walk over the top of someone or something or something without treading on them. People just walked over the man who had collapsed on the sidewalk instead of stopping to see if he was OK. I stepped gingerly over the pieces of broken glass on the floor.

2. To take one or more steps to reach some nearby person, thing, or position. When your name is called, please step over to receive your corrected exams. She stepped over to the window to see what was happening outside. Please step over here and show me what's in your hands.

3. To put one's feet over some physical barrier or threshold in order to cross it. The detective stepped over the police tape to investigate the crime scene. She has been criticized for stepping over the picket line to return to work before the strike was over.

4. To cross some threshold dictating what is considered appropriate or acceptable (or not). She has been criticized for stepping over the picket line to return to work before the strike was over. I know you don't agree with the teacher's methods, but you really stepped over the line by insulting him like that.