What is the meaning of Tight_end?

The position at the end of the offensive line whose primary jobs are to block and serve as a short receiver.

A player (called an end) playing the position of tight end (sense 1.1).

2. The position at the end of the offensive line whose primary jobs were to block and serve as a short receiver; this position is no longer used.
3. A player (called an end) playing the position of tight end (sense 2.1).

The position at the end of the offensive line whose primary jobs were to block and serve as a short receiver; this position is no longer used.

A player (called an end) playing the position of tight end (sense 2.1).

Source: wiktionary.org