Definition from Wiktionary, the free dictionary
- (athletics) The straight part of a running track (or similar) leading to the finishing line.
He got boxed in amongst four African runners in the back straight of the last lap, and was only able to get out into the clear coming into the home straight.
- (figuratively, by extension) The final part of something, especially the final part with respect to time of a long process.
- (part of a running track): back straight