one swallow does not make a spring

one swallow does not make a spring

One piece of evidence does not mean that something is definitely the case or is going to happen. A reference to the migration of swallows that happens in the spring or early summer. I know you're excited about your exam grades, but you haven't gotten your report card yet, and one swallow does not make a spring.
See also: does, make, not, one, spring, swallow
Farlex Dictionary of Idioms.
See also:
  • one swallow does not make a summer
  • one swallow doesn't make a summer
  • one swallow does not a spring make
  • one swallow does not a summer make
  • definitely
  • definitely not
  • Definitely not!
  • no doubt about it
  • (as) sure as eggs (is eggs)
  • swallow up