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crumb (n.)

Middle English crome, crumme, from Old English cruma "fragment of bread or other food, a morsel, small fragment," from a West Germanic root of obscure origin (compare Middle Dutch crume, Dutch kruim, German Krume); perhaps from a PIE word for "small particle of bread" and cognate with Greek grumea "bag or chest for old clothes" (Beekes writes: "In origin, the word probably denoted small things of little value, later also the chest, etc.), Albanian grime.

The unetymological -b- appeared mid-15c., in part by analogy with words like dumb. Slang meaning "lousy person" is 1918, from crumb, U.S. slang for "body-louse" (1863), which were so called from resemblance.

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Definitions of crumb from WordNet
1
crumb (v.)
coat with bread crumbs;
crumb a cutlet
crumb (v.)
break into crumbs;
crumb (v.)
remove crumbs from;
crumb the table
2
crumb (n.)
a very small quantity of something;
he gave only a crumb of information about his plans
there were few crumbs of comfort in the report
crumb (n.)
a person who is deemed to be despicable or contemptible;
Synonyms: rotter / dirty dog / rat / skunk / stinker / stinkpot / bum / puke / lowlife / scum bag / so-and-so / git
crumb (n.)
small piece of e.g. bread or cake;
From wordnet.princeton.edu