Croke

Obs. exc. dial. [Etymology uncertain. Cf. CORK sb.³] Core of a fruit; refuse, dross.

c. 1450.  Nominale, in Wr.-Wülcker, 719/6. Partes fructuum … Hec arula the crok.

1847–78.  Halliwell, Croke, refuse; the bad or useless part of anything. Linc.

1886.  S. W. Linc. Gloss., Croke, refuse: as ‘It’s only an old croke.’