n. & v.
—n.
1 a black European and Asiatic bird, Corvus frugilegus, of the crow family, nesting in colonies in tree-tops.
2 a sharper, esp. at dice or cards; a person who lives off inexperienced gamblers etc.
—v.tr.
1 charge (a customer) extortionately.
2 win money from (a person) at cards etc. esp. by swindling.
Etymology: OE hroc
2.
n. a chess piece with its top in the shape of a battlement.
Etymology: ME f. OF roc(k) ult. f. Arab. rukk, orig. sense uncert.
Useful english dictionary. 2012.