sure

1 sure /ˈʃɚ/ Brit /ˈʃɔː/ adjective
surer; surest
1 sure
/ˈʃɚ/ Brit /ˈʃɔː/
adjective
surer; surest
Britannica Dictionary definition of SURE
[also more sure; most sure]
1 
not used before a noun : not having any doubt about something : convinced or certain
2 
: not allowing any doubt or possibility of failure
— see also sure thing (below)
3 
— used to say that something will definitely happen or that someone will definitely do something — usually followed by to + verb
4 
: known to be true or correct
5 
a  : firm or solid
— often used figuratively
b  : calm, steady, and confident

be sure

— used to tell someone not to forget to do something

for sure

: without a doubt : definitely or certainly

make sure

: to find out or do something so that you have no doubt about whether something is true, correct, will happen, etc.

sure of yourself

1 
: confident in your abilities
2 
somewhat disapproving : overly confident or arrogant

sure thing

informal
— used to say “yes” or to agree to a request or suggestion
— see also 1sure 2 (above)

to be sure

formal
— used to say that you admit that something is true
2 sure /ˈʃɚ/ Brit /ˈʃɔː/ adverb
2 sure
/ˈʃɚ/ Brit /ˈʃɔː/
adverb
Britannica Dictionary definition of SURE
informal
1 
a  — used to say “yes” or to agree to a request or suggestion
b  — used to disagree with a negative statement or suggestion
2 
— used to emphasize that you agree with the first part of the statement that you are about to make
3 
US — used as an informal way to accept someone's thanks
4 
US — used for emphasis

sure enough

— used to say that what happened was not surprising or unexpected