I owe you an apology - I'm afraid I forgot to send that report.
Please accept my apologies.
She forgot my birthday so she sent me flowers as an apology.
When we say 'sorry' to someone, we are making an apology. 'I'm sorry about that' or 'my apologies' are other things we can say.
we owe you an apology; Robert can’t come and sends his apologies;
You are late again. What's your excuse this time?
it's a lame excuse
what a lame excuse