1. to fail to take advantage of an opportunity or experience something desirable
Usage: phrasal verb; often followed by 'on'
2. to be excluded from or not included in something
Usage: phrasal verb; British English

Examples

• If you don't register now, you'll miss out on the early-bird discount.
• She missed out on the job because she didn't apply in time.
• Don't miss out—this sale ends tomorrow!
• He felt like he was missing out while his friends were at the party.
• You'll miss out if you don't sign up for the workshop.
• They missed out on seeing the concert because tickets sold out.