Definitions:

1. In American and Canadian football, refers to the distance markers on the field representing incremental units of 10 yards, that help determine field position and measure the distance to the end zone. NOUN
   • He caught the pass and ran all the way to the 50-yard line before being tackled.
2. In American football, refers to one of the markings on the field that indicate distance from the nearest end zone. NOUN
   • The team advanced to the 20-yard line, putting them close to a scoring opportunity.

Synonyms:

• end zone line
• field line
• playing line