Cordon

Noun

 * 1)  A ribbon normally worn diagonally across the chest as a decoration or insignia of rank etc.
 * 2) A line of people or things placed around an area to enclose or protect it.
 * 3)  The arc of fielders on the off side, behind the batsman - the slips and gully.
 * 4) (botany) A woody plant, such as a fruit tree, pruned and trained to grow as a single stem on a support.

Verb

 * 1)  To form a cordon around an area in order to prevent movement in or out.

Thesaurus
advance guard, armed guard, bank guard, beleaguer, beset, besiege, block, blockade, blue ribbon, bolt, bottleneck, bound, box in, cage, catch, chamber, close in, coast guard, compass, contain, coop, coop in, coop up, cordon bleu, cordon off, cordon sanitaire, cordoning off, corral, cull out, curtain, decoration, decoration of honor, determent, deterrent, difficulty, divide, drawback, encircle, enclose, encompass, enshrine, fence in, garrison, garter, ghettoize, gin, goalie, goalkeeper, goaltender, gold star, grand cordon, guard, guarder, guardsman, hang-up, hazard, hedge in, hem in, hitch, house in, hurdle, impound, imprison, incarcerate, include, inlying picket, insulate, isolate, isolation, jail, jailer, joker, keep apart, keep aside, kennel, lay aside, leaguer, mew, mew up, objection, obstacle, obstruction, obstructive, one small difficulty, order, ornament, outguard, outpost, pen, pen in, pick out, picket, pocket, put aside, quarantine, quarantine flag, rail in, rear guard, red ribbon, riband, ribbon, riddle, rope off, rub, sanitary cordon, screen, seal off, seclude, seclusion, security guard, segregate, segregation, separate, separation, set apart, set aside, shrine, shut in, shut up, sieve, sift, snag, sort out, stable, star, stumbling block, stumbling stone, surround, thrash, thresh, train guard, van, vanguard, wall in, warder, winnow, wrap, yard, yard up, yellow flag, yellow jack