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The Collaborative International Dictionary
Pickeering

Pickeer \Pick*eer"\, v. i. [imp. & p. p. Pickeered; p. pr. & vb. n. Pickeering.] [F. picorer to go marauding, orig., to go to steal cattle, ultimately fr. L. pecus, pecoris, cattle; cf. F. picor['e]e, Sp. pecorea robbery committed by straggling soldiers.] To make a raid for booty; to maraud; also, to skirmish in advance of an army. See Picaroon. [Obs.]
--Bp. Burnet.

Wiktionary
pickeering

vb. (present participle of pickeer English)