crumb noun
ADJ. biscuit, bread (also breadcrumb), cake
VERB + CRUMB brush (away), sweep (away) She brushed the cake crumbs off the table. | drop, scatter He bit into the roll, scattering crumbs.
PREP. ~ of a few crumbs of bread
You can also check other dicts: crumb (English, 中文解释 ), wordnet sense, Collins Definition