Meaning of the word "one swallow does not make a summer" in English

What does "one swallow does not make a summer" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

one swallow does not make a summer

US /wʌn ˈswɑː.loʊ dʌz nɑːt meɪk ə ˈsʌm.ɚ/
UK /wʌn ˈswɒl.əʊ dʌz nɒt meɪk ə ˈsʌm.ə/
"one swallow does not make a summer" picture

Idiom

a single fortunate event does not mean that what follows will also be good, or that a general trend has started

Example:
The team won their first game, but one swallow does not make a summer.
Sales improved this month, but remember that one swallow does not make a summer.