PEN (3)
Source: 566, 567
pen (3). Pen, v.t. pa. pent, to confine, inclose, shut in
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Pen, v. t. [imp. & p. p. Penned (?) or Pent (�); p. pr. & vb. n. Penning.] [[OE. pennen, AS. pennan in on-pennan to unfasten, prob. from the same source as pin, and orig. meaning, to fasten with a peg.See Pin, n. & v.]] To shut up, as in a pen or cage; to confine in a small inclosure or narrow space; to coop up, or shut in; to inclose. “Away with her, and pen her up.” Shak. Watching where shepherds pen their flocks at eve. Milton.