chumbling

Verb

chumble (third-person singular simple present chumbles, present participle chumbling, simple past and past participle chumbled)

1. (ambitransitive) To peck at or nibble.
   • The baby, whimpering when Janey thrust the crust into his mouth, now whimpered no longer but chumbled at the dry bread, slobbered over it, wiped it down Janey's front, dropped it in the grass and at once forgot about it, sitting on her lap […]1941, Sarah Campion, Mo Burdekin, page 8