Definition of "trencherman"

The heavyweight champion of the world was off his feed. . Rocky, ordinarily a first-rate trencherman, was pushing away from the breakfast table after downing only two eggs and a pair of lamb chops.

1954 June 28, “Sport: Bumbling Champ”, in Time

My own preference when it comes to a substantial meal might be more than just a scotch egg but that’s because I’m a hearty trencherman.

2020 December 1, “Scotch egg ‘starter’ rather than substantial meal”, in msn.com