Definition of "brock"

Or with pretence of chasing thence the brock, Send in a cur to worry the whole flock.

1756 , Ben Jonson, “The Tale of a Tub”, in Peter Whalley, editor, The Works of Ben Jonson‎, page 108

By sportsmen the stag is called, the first year, a calf or hind-calf ; the second year, a knobber ; the third, a brock ; the fourth, a staggard ; the fifth, a stag ; the sixth, a hart.

1833, “Stag”, in The Sportsman’s Cabinet, and Town and Country Magazine‎, page 417

Then other boys noticed that he had a softness for me, and brocked us both, so that I, who had been as unconscious as ever of anything erotic, suddenly learnt what was going on &, by some profound power of suggestion, what my feelings actually were.

1988, Alan Hollinghurst, The Swimming-Pool Library, paperback edition, London: Penguin Books, page 112