1.
If you leave someone or something behind, you go away permanently from them.
Many of the women had left their husbands behind and they told of their fears that they may never see them again...
We hear of women who run away, leaving behind their homes and families.
PHRASAL VERB: V n P, V P n (not pron)
2.
If you ~ an object or a situation, it remains after you have left a place.
I don’t want to leave anything behind...
A misty rain in the morning had left behind a coolness that would stay for hours.
PHRASAL VERB: V n P, V P n (not pron)
3.
If a person, country, or organization is left behind, they remain at a lower level than others because they are not as quick at understanding things or developing.
We’re going to be left behind by the rest of the world...
I got left behind at school with the maths...
Inflation has left them way behind.
PHRASAL VERB: be V-ed P, get V-ed P, V n P