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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.
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.
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.
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]
n. diarrhea, especially that experienced in the summer. I’ve got a touch of the summer complaint.
See also: summer