Classicly

Chipping or paring bread. “Non comedas crustam, colorem quia gignit adustam ... the Authour in this Text warneth vs, to beware of crusts eating, because they ingender a-dust cholor, or melancholly humours, by reason that they bee burned and dry. And therefore great estates the which be chollerick of nature, cause the crustes aboue and beneath to be chipped away; wherfore the pith or crumme should be chosen, the which is of a greater nourishment then the crust.” Regimen Sanitatis Salerni, ed. 1634, p. 71. Fr. chapplis, bread-chippings. Cotgrave.