Definitions:

1. action taken too late and too feeble to be of any use noun
   • The student's effort was a day late and a dollar short.
2. Another way to say too little too late. ADJECTIVE
   • This apology is a day late and a dollar short. You will have to do better if you want me back as a customer.
3. Missed an opportunity due to tardiness or lack of effort. ADJECTIVE
   • The team is a day late and a dollar short, but it looks like they're starting to find a rhythm, and they may score in a moment.

Synonyms:

• It's useless now
• This ship has sailed
• Too little too late