If something is a "sure thing" then it is definite, it can be trusted, it is certain. If you ask someone to do something, and they say "sure thing", they are enthusiastically saying 'yes, I will'.

got it Seth, thank you so much.

If something is a "sure thing" then it is definite, it can be trusted, it is certain. If you ask someone to do something, and they say "sure thing", they are enthusiastically saying 'yes, I will'.

It means that something is certain/for sure/absolute. It's mostly used in 2 situations, 1: As a strong "yes" in response to a request. 2: To show that we believe something will 100% happen. EX. A: Can you help me with my homework? B: Sure thing! A: I think we'll lose a lot of money if we bet on the horse race. B: But horse number 5 has won almost every race lately! We should bet on him, it's a sure thing.