Bob

Chamber's Etymological of the English Language · 1895 · p. 57
bob, v.i to move quickly up and down, to dangle to fish with a bob, v.t. to move in a short jerking manner.—fir.fi. bobt/ing fia.fi, bobbed'. n a short jerking motion a slight blow anything that moves with a bob or swing a pendant. [Perhaps imitative, hke Gael, bog, to agitate, babag baban a ta el.
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