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One swallow does not make a summer,

 and One swallow does not a summer make.
Prov. You should not assume that something is true just because you have seen one piece of evidence for it. Amanda: I got a good grade on this quiz! My troubles in school are over. Nancy: One swallow does not a summer make.
See also: does, make, not, one, summer, swallow

an Indian summer

1. a period of warm weather which sometimes happens in early autumn Both the UK and Ireland have been enjoying an Indian summer over the past few weeks.
2. a successful or pleasant period in someone's life, especially towards the end of their life The book describes the last 20 years of Churchill's life, including his Indian summer as prime minister between 1951 and 1955.
See also: Indian, summer

one swallow doesn't make a summer

  (British & Australian)
something that you say which means because one good thing has happened, you cannot therefore be certain that more good things will happen and the whole situation will improve Okay, they won their last game but one swallow doesn't make a summer. They're still bottom of the league.
See also: make, one, summer, swallow

Indian summer

A period of mild, sunny weather occurring in late autumn, usually following a seasonable cold spell. For example, We had two whole days of Indian summer this year, and then it turned cold again. [Late 1700s]
See also: Indian, summer

summer complaint

n. diarrhea, especially that experienced in the summer. I’ve got a touch of the summer complaint.
See also: summer
References in classic literature ?
My young friend was willing, in short, that the fresh verdure of his growing reputation should spread over my straggling and half-naked boughs; even as I have sometimes thought of training a vine, with its broad leafiness, and purple fruitage, over the worm-eaten posts and rafters of the rustic summer house.
May herself could not understand his obscure reluctance to fall in with so reasonable and pleasant a way of spending the summer.
In the hot summer light his floridness seemed heavy and bloated, and but for his erect square- shouldered walk he would have looked like an over-fed and over-dressed old man.
As a result, Anne had the golden summer of her life as far as freedom and frolic went.
I've had a perfectly beautiful summer, Marilla, and now I'm rejoicing as a strong man to run a race, as Mr.
Sometimes in summer she takes a boarder to help out.
Removing the weeds, putting fresh soil about the bean stems, and encouraging this weed which I had sown, making the yellow soil express its summer thought in bean leaves and blossoms rather than in wormwood and piper and millet grass, making the earth say beans instead of grass -- this was my daily work.
Those summer days which some of my contemporaries devoted to the fine arts in Boston or Rome, and others to contemplation in India, and others to trade in London or New York, I thus, with the other farmers of New England, devoted to husbandry.
And the hollyhocks turned out to be rather ugly colours, so that my first summer was decorated and beautified solely by sweet-peas.
At present we are only just beginning to breathe after the bustle of getting new beds and borders and paths made in time for this summer.
Sir," said she, "that Mr Summer, the son of your friend, educated at your expense, who, after living a year in the house as if he had been your own son, died there of the small-pox, was tenderly lamented by you, and buried as if he had been your own; that Summer, sir, was the father of this child.
Summer have I become entirely, and summer-noontide!
Besides this, Konstantin Levin was not at his ease with his brother, because in summer in the country Levin was continually busy with work on the land, and the long summer day was not long enough for him to get through all he had to do, while Sergey Ivanovitch was taking a holiday.
I haven't many by me at this time of year, but these shelves will be full--next summer.
If Miss Summers will not keep her, you must find me out another school, unless we can get her married immediately.