|Origin:||sur, from Latin securus; SECURE1|
sure1 S1 W1
confident that you know something or that something is true or correct [= certain]:
certain you know something[not before noun]
'That's Sarah's cousin.' 'Are you sure?'
'What time does the show start?' 'I'm not sure.'
I'm sure there's a logical explanation for all this.
Are you sure that you know how to get there?
My mother, I felt sure, had not met him before.
not sure how/where/when etc
Henry wasn't sure how to answer this.
not sure if/whether
I'm not sure if I'm pronouncing this correctly.
He wasn't even sure of his mother's name.
They were talking about her, she was sure of that.
to find out if something is true or to check that something has been done:
'Did you lock the front door?' 'I think so, but I'd better make sure.'
make sure (that)
I wanted to make sure you were all right.
First, make sure the printer has enough paper in it.
certain about what you feel, want, like etc
certain about your feelings[not before noun]
Are you sure you really want a divorce?
Carla says she is very sure of her love for Tony.
certain to be true
certain to be true
one thing is (for) sure
One thing's for sure, we'll never be able to move this furniture on our own.
Those black clouds are a sure sign of rain.
certain to happen, succeed, or have a particular result
certain to happen/succeed
sure to do something
He's sure to get nervous and say something stupid.
sure way to do something/of doing something
There was only one sure way of finding out - and that was to visit him.
sure thing/bet American English (=something that will definitely happen, win, succeed etc)
to be certain to get something or be certain that something will happen:
United must beat Liverpool to be sure of winning the championship.
You can be sure of one thing - there'll be a lot of laughs.
confident in your own abilities and opinions, sometimes in a way that annoys other people:
Kids nowadays seem very sure of themselves.
used to tell someone to remember to do something:
Be sure to ring and let us know you've got back safely.
certainly or definitely:
No one knows for sure what really happened.
used to emphasize that something is true:
We'll always need teachers, that's for sure.
c) American English informal spoken
used to agree with someone
10 spoken informal
used to agree to something:
'Can you pick me up later?' 'Sure thing.'
11 spoken formal
used to admit that something is true, before saying something that is the opposite:
It was difficult, to be sure, but somehow we managed to finish the job.
12 spoken informal
used to emphasize a statement:
If I could get you out of there, I sure as hell would.
if you have a sure hold or footing, your hands or feet are placed firmly so they cannot slip
—sureness noun [uncountable]