Etymology
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chaff (n.)

"husks of wheat, oats, or other grains," Old English ceaf "chaff," probably from Proto-Germanic *kaf- "to gnaw, chew" (source also of Middle Dutch and Dutch kaf, German Kaff), from PIE root *gep(h)- "jaw, mouth" (see jowl (n.1)). Used figuratively for "worthless material" from late 14c.

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Definitions of chaff
1
chaff (n.)
material consisting of seed coverings and small pieces of stem or leaves that have been separated from the seeds;
Synonyms: husk / shuck / stalk / straw / stubble
chaff (n.)
foil in thin strips; ejected into the air as a radar countermeasure;
2
chaff (v.)
be silly or tease one another;
Synonyms: kid / jolly / josh / banter
From wordnet.princeton.edu