This is the 14000th most frequent Polish word.
posłać
To send.
In this sentence, 'posłać' is used in the context of sending an item, similar to 'send' in English.
Posłałem list do mojego przyjaciela.
I sent a letter to my friend.
Here, 'posłać' conveys the act of directing someone to go somewhere, often used for sending people.
Matka posłała dzieci do szkoły.
The mother sent the children to school.
In this instance, 'posłać' is utilized metaphorically, referring to conveying good wishes rather than a physical item.