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I guess

 and I expect; I suppose; I suspect 
1. a phrase that introduces a supposition. (Frequently, in speech, suppose is reduced to 'spose, and expect and suspect are reduced to 'spect. The apostrophe is not always shown.) Bob: I guess it's going to rain. Bill: Oh, I don't know. Maybe so, maybe not. Alice: I expect you'll be wanting to leave pretty soon. John: Why? It's early yet.
2. a vague way of answering 'yes'. John: You want some more coffee? Jane: I 'spose. Alice: Ready to go? John: I spect.
See also: guess

I guess not.

 and (I) don't think so.; I expect not.; I suppose not.; I suspect not.; I think not.
a vague statement of negation. (More polite or gentle than simply saying no. Frequently, in speech, suppose is reduced to 'spose, and expect and suspect are reduced to 'spect. The apostrophe is not always shown.) Bill: It's almost too late to go to the movie. Shall we try anyway? Mary: I guess not. Tom: Will it rain? Mary: I 'spect not.
See also: guess, not

I guess (so).

 and I believe so.; I expect (so).; I suppose (so).; I suspect (so).; I think so.
a vague expression of assent. (Frequently, in speech, suppose is reduced to 'spose, and expect and suspect are reduced to 'spect. The apostrophe is not always shown.) Tom: Will it rain today? Bob: I suppose so. Sue: Happy? Bill: I 'spect. Sue: You don't sound happy. Bill: I guess not.
See also: guess
References in classic literature ?
Just then I heard the handle of the door moving: I suppose Bertha had heard from the women that they had been dismissed: probably a vague fear had arisen in her mind, for she entered with a look of alarm.
Moreover, the figure near at hand suffers on such occasion, because it shows up its sorriness without shade; while vague figures afar off are honoured, in that their distance makes artistic virtues of their stains.
If there's going to be any trouble I want to be there," was his vague reflection, as he threw to Jotham the unexpected order to unhitch the team and lead them back to the barn.
Kennedy, leaning his elbow on the edge of the car, so as to keep an eye on the cylinder, which was actively at work, gazed out upon the calm obscurity; he eagerly scanned the horizon, and, as often happens to minds that are uneasy or possessed with preconceived notions, he fancied that he sometimes detected vague gleams of light in the distance.
Grown careless from months of continued safety, during which time he had seen no dangerous animals during the daylight hours, he had left his rifles and revolvers all within the little cabin, and now that he saw the great ape crashing through the underbrush directly toward him, and from a direction which practically cut him off from escape, he felt a vague little shiver play up and down his spine.
And this movement of reconstruction of which Prince Andrew had a vague idea, and Speranski its chief promoter, began to interest him so keenly that the question of the army regulations quickly receded to a secondary place in his consciousness.
Their ardor alternated between a vague ideal and the common yearning of womanhood; so that the one was disapproved as extravagance, and the other condemned as a lapse.
I read it with a tempered pleasure, and with a vague resentment of its trespass upon Thomson's ground in the division of its parts under the names of the seasons.
But, I hear you objecting, why is it that these racial memories are not ours as well, seeing that we have a vague other-personality that falls through space while we sleep?
In vague ways it was borne in upon him that they, too, were not happy.
If this be denied him, then must he have acted wholly by instinct--which would seem more marvellous on the face of it than if, in dim ways, he had performed a vague thought-process.
Vague apprehensions of the next discovery to come, filled his mind for the first time.
Jimmie grew large enough to take the vague position of head of the family.
We sometimes have images that are by no means peculiarly vague, which yet we do not trust--for example, under the influence of fatigue we may see a friend's face vividly and clearly, but horribly distorted.
From the vague answers to his question how much hay had been cut on the principal meadow, from the hurry of the village elder who had made the division, not asking leave, from the whole tone of the peasant, Levin perceived that there was something wrong in the division of the hay, and made up his mind to drive over himself to look into the matter.