English definition of “behind”
BACK › at or to the back of someone or something: Somebody grabbed me from behind.
SLOWER › slower or later than someone else, or than you should be: She's behind with the rent (= is late to pay it).
PLACE › in the place where someone or something was before: You go on ahead. I'll stay behind and tidy up. When we got to the restaurant, I realized that I had left my purse behind.