stay behind meaning

stay behind to remain somewhere when other people have left:
▪ As a punishment, several of the children had to stay behind after school.
▪ I stayed behind to prepare my speech while the others went off for the day.

[American slang]
[for someone] to remain in a place when others have left.
  I will stay behind and tell the late arrivers where you have gone.
  Fred always stayed behind to clean up.

[Defence]
Agent or agent organization established in a given country to be activated in the event of hostile overrun or other circumstances under which normal access would be denied.

Examples

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1. they are my sheep. i will stay behind.
2. the teacher told him to stay behind after class.
3. staff must stay behind after hours to catch up on their work.
4. whatever happens, stay behind that shield
5. eiina, stay behind and wipe down the blackboard