sure thing
Sure thing (interjection) means Yes, of course; used as a relaxed, friendly way of agreeing to a request. Example: “Can you grab the door?" "Sure thing.”
How to use sure thing
Learner’s notesIn plain EnglishEither 'yes, happy to' or 'a certainty'.
Informal, especially common in American English.
As an interjection it stands alone; as a noun it needs an article: it's a sure thing.
Fill the gap
Can you complete this real example?
"Can you grab the door?" "_____."