Definitions

1. verb

to fail to participate in or attend (an event) because one did not receive an invitation or did not know about it

“She was disappointed to miss out on the concert because she hadn’t received a ticket.”

2. noun

the act of missing out on an event or opportunity

“Missing out on the concert was a big disappointment for her.”

3. verb (informal)

to deprive someone of the opportunity to participate in or attend something

“He was accused of trying to miss out his friend from the party by not inviting him.”