leave behind is a verb meaning "depart and not take along". It carries 3 recorded senses.
depart and not take along
“He left behind all his possessions when he moved to Europe”
leave unchanged or undisturbed or refrain from taking
“leave it as is”
“leave the young fawn alone”
“leave the flowers that you see in the park behind”
Definitions, synonyms and semantic relations for leave behind come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.