Dictionary.com
definitions

seventh-inning stretch

[sev-uh nth-in-ing, -in-]
noun
  1. Baseball. a point in the game when spectators rise from their seats to relax by stretching their legs, usually after six and one-half innings.
  2. any point or period of pause, rest, reconsideration, or the like.

Origin of seventh-inning stretch

First recorded in 1955–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018