This is the 6430th most frequent Swedish word.
lämnar
"Leaves" or "hands over."
In this sentence, 'lämnar' is used to denote that the subject ('Jag', which is 'I') is departing or leaving a place, which in this case is work.
Jag lämnar jobbet klockan fem.
I leave work at five o'clock.
Here, 'lämnar' is applied to convey the action of dropping something off or leaving something at a specific location, referring to the children in this context.
Han lämnar barnen på skolan varje morgon.
He drops the children off at school every morning.
In this case, 'lämnar' is used in the sense of delivering or leaving something (a message) for someone.