‘tail’ or perhaps ‘trimmed hair (of tail, etc.)’ (Modern English dock)
Proposed ON Etymon (OIcel representative)
cp. dokk, dokka 'windlass'
Other Scandinavian Reflexes
Icel dokkur, Norw dokke; Icel dokk, Norw dokka, Sw docka
Phonological and morphological markers
This is the only instance cited by MED for the ME n.; the next recorded instances in OED are from the 16c. and have no discernible dialectal distribution. (The related verb is first attested in the late 14c; see MED s.v. dokken v., OED s.v. dock v.1.)
Occurrences in the Gersum Corpus
Opinions differ over the precise referent of Gaw 193: TGD and OED take it to refer to the tail itself, others to the trimming of the hair (Vant, PS, GDS, MED, AW).