Answered April 22nd, 2019

Emmitt Smith rushes for 237 yards against Philadelphia to break Tony Dorsett's 1977 Cowboys single-game record of 206. DeMarco Murray ultimately passed Smith with 253 in 2011.

What are the most rushing yards in a game by Emmitt Smith?
Interpreted as:
What are the most rushing yards in a regular season game by Emmitt Smith?