E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Trencher.
A good trencher-man. A good eater. The trencher is the platter on which food is cut (French, trancher, to cut), by a figure of speech applied to food itself.
1
He that waits for anothers trencher, eats many a late dinner. He who is dependent on others must wait, and wait, and wait, happy if after waiting he gets anything at all.