Ok vs. Sure

(informal) lang=en

a state in south central United States

an endorsement;

Example: ‘they gave us the O.K. to go ahead’;

being satisfactory or in satisfactory condition;

Example: ‘an all-right movie’; ‘the passengers were shaken up but are all right’; ‘is everything all right?’; ‘everything's fine’; ‘things are okay’; ‘dinner and the movies had been fine’; ‘another minute I'd have been fine’;

sentence-initial expression of agreement

used to express agreement or acceptance

Example: ‘OK, I'll pass on your message’; ‘OK, OK, I give in’;

used to introduce an utterance

Example: ‘‘OK, let's go’’;

used at the end of a statement to invite agreement, approval, or confirmation

Example: ‘humour me, OK?’;

satisfactory but not especially good

Example: ‘the flight was OK’;

in a satisfactory physical or mental state

Example: ‘are you okay, Ben?’;

permissible; allowable

Example: ‘it's not OK to say that to a teacher’;

in a satisfactory manner or to a satisfactory extent

Example: ‘the computer continues to work OK’;

an authorization or approval

Example: ‘the officer gave me the OK’;

give approval to

Example: ‘despite objections, the committee ok'd the construction’;

Physically secure and certain, non-failing, reliable.

Example: ‘This investment is a sure thing.’; ‘The bailiff had a sure grip on the prisoner's arm.’;

Certain in one's knowledge or belief.

Example: ‘He was sure she was lying.’; ‘I am sure of my eventual death.’; ‘John was acting sure of himself but in truth had doubts.’;

Certain to act or be a specified way.

Example: ‘Be sure to lock the door when you leave.’;

(obsolete) Free from danger; safe; secure.

(obsolete) Betrothed; engaged to marry.

(modal adverb) Without doubt, certainly.

Example: ‘Sure he's coming! Why wouldn't he?’; ‘"Did you kill that bear yourself? ―"I sure did!"’;

Yes. (Expresses noncommittal agreement or consent.)

Example: ‘"Do you want me to put this in the garage?" "Sure, go ahead."’;

Yes; of course.

Example: ‘"Could you tell me where the washrooms are?" "Sure, they're in the corner over there."’;

Certainly knowing and believing; confident beyond doubt; implicity trusting; unquestioning; positive.

Example: ‘We are sure that the judgment of God is according to truth against them which commit such things.’; ‘I'm sure care 's an enemy of life.’;

Certain to find or retain; as, to be sure of game; to be sure of success; to be sure of life or health.

Fit or worthy to be depended on; certain not to fail or disappoint expectation; unfailing; strong; permanent; enduring.

Example: ‘The Lord will certainly make my lord a sure house; because my lord fighteth the battles of the Lord.’; ‘The testimony of the Lord is sure.’; ‘Which put in good sure leather sacks.’;

Betrothed; engaged to marry.

Example: ‘The king was sure to Dame Elizabeth Lucy, and her husband before God.’; ‘I presume . . . that you had been sure as fast as faith could bind you, man and wife.’;

Free from danger; safe; secure.

Example: ‘Fear not; the forest is not three leagues off;If we recover that we are sure enough.’; ‘She that's made sure to him she loves not well.’;

In a sure manner; safely; certainly.

Example: ‘'T is pleasant, sure, to see one's name in print.’;

having or feeling no doubt or uncertainty; confident and assured;

Example: ‘felt certain of success’; ‘was sure (or certain) she had seen it’; ‘was very sure in his beliefs’; ‘sure of her friends’;

exercising or taking care great enough to bring assurance;

Example: ‘be certain to disconnect the iron when you are through’; ‘be sure to lock the doors’;

certain to occur; destined or inevitable;

Example: ‘he was certain to fail’; ‘his fate is certain’; ‘In this life nothing is certain but death and taxes’; ‘he faced certain death’; ‘sudden but sure regret’; ‘he is sure to win’;

physically secure or dependable;

Example: ‘a sure footing’; ‘was on sure ground’;

capable of being depended on;

Example: ‘a quick and certain remedy’; ‘a sure way to distinguish the two’; ‘wood dust is a sure sign of termites’;

(of persons) worthy of trust or confidence;

Example: ‘a sure (or trusted) friend’;

infallible or unfailing;

Example: ‘a sure (or true) sign of one's commitment’;

certain not to fail;

Example: ‘a sure hand on the throttle’;

impossible to doubt or dispute;

Example: ‘indisputable (or sure) proof’;

definitely or positively (`sure' is sometimes used informally for `surely');

Example: ‘the results are surely encouraging’; ‘she certainly is a hard worker’; ‘it's going to be a good day for sure’; ‘they are coming, for certain’; ‘they thought he had been killed sure enough’; ‘he'll win sure as shooting’; ‘they sure smell good’; ‘sure he'll come’;