or so

or so

A phrase used to approximate an amount. It typically follows a number or quantity of some kind. A: "How many more chairs do you think we'll need?" B: "Probably 20 or so."
Farlex Dictionary of Idioms.

or so

Approximately, especially alluding to a number, as in Four hundred or so guests are invited. [Late 1500s]
The American Heritage® Dictionary of Idioms by Christine Ammer.

...or so

used after a number, an amount, etc. to show that it is not exact: He stayed for a week or so. Take a kilo or so of sugar...
Farlex Partner Idioms Dictionary
See also:
  • (one's) best foot forward
  • best foot forward
  • (as) sure as eggs (is eggs)
  • beck and call
  • 57
  • and the rest
  • and how
  • and how!
  • in round figures
  • in round figures/numbers