Meaning of scrimmage line in English:

scrimmage line

noun

American Football Canadian Football
  • An imaginary line parallel to the goal lines, on either side of which opposing players line up at the start of a play from scrimmage, and which neither team is permitted to cross until play has begun; compare "line of scrimmage" and the note there.

Origin

Late 19th century; earliest use found in Columbia Spectator.