This is the 15070th most frequent Korean word.
발송했다
"발송했다" means "sent" or "dispatched."
Here, '발송했다' is used to describe the act of sending a physical item, i.e., a letter.
편지를 발송했다.
I sent the letter.
In this sentence, '발송했다' refers to sending a digital message, like an email.
이메일을 발송했다.
I sent the email.
This usage of '발송했다' pertains to shipping or sending a parcel or package.