surething
nounUK /ˈʃɔːˌθɪŋ/
US /ˈʃʊrˌθɪŋ/
A sure thing is something that will definitely happen.
Winning the game was a sure thing because our team was much better.
OTHER MEANINGS
2. Something that is certain to succeed or happen.
The movie was a sure thing at the box office.
3. A person or team that is certain to win.
Everyone bet on the champion because he was a sure thing.
4. A reply meaning 'yes, of course.'
'Can you help me?' 'Sure thing!'