WordNet (r) 3.0 (2006):

shut in
    v 1: surround completely; "Darkness enclosed him"; "They closed
         in the porch with a fence" [syn: enclose, close in,
         inclose, shut in]

Moby Thesaurus II by Grady Ward, 1.0:

169 Moby Thesaurus words for "shut in":
   Diogenes, Hieronymian, Hieronymite, Timon of Athens, anchoress,
   anchorite, anchoritic, apoplectic, arthritic, ascetic, barred,
   bedridden invalid, beleaguer, beleaguered, beset, besiege,
   besieged, blockade, blockaded, bottle up, bound, box in, box up,
   cabined, cage, caged, case, chamber, check, cloister, cloistered,
   cloistered monk, close in, closed-in, closet cynic, compass,
   confine, confined, constrain, consumptive, contain, coop, coop in,
   coop up, cooped, cordon, cordon off, cordoned, cordoned off,
   cork up, corral, corralled, cramped, crib, cribbed, desert fathers,
   desert saints, detain, detained, domestic, dyspeptic, encage,
   encircle, enclose, enclosed, encompass, enshrine, envelop,
   epileptic, eremite, eremitic, fence in, fenced, hedge in, hedged,
   hem, hem in, hemmed, hermit, hermitess, hermitic, hermitish, hold,
   hold in custody, hold in restraint, homebody, house in, immure,
   immured, impound, impounded, imprison, imprisoned, in confinement,
   incarcerate, incarcerated, include, incurable, inhibit, inpatient,
   invalid, isolationist, jail, jailed, keep in, keep in custody,
   keep in detention, kennel, kept in, leaguer, leaguered, loner,
   marabout, mew, mew up, mewed, outcast, outpatient, paled, pariah,
   patient, pen, pen in, pen up, penned, pent, pent-up, pillar saint,
   pillarist, pocket, pound, quarantine, quarantined, rail in, railed,
   recluse, restrain, restrained, restrict, restricted, rheumatic,
   seal up, seclusionist, sequestered, shackle, shrine, shut in,
   shut up, sick person, solitaire, solitary, solitudinarian, spastic,
   stable, stay-at-home, stylite, sufferer, surround, terminal case,
   the sick, under restraint, valetudinarian, wall, wall in, walled,
   walled-in, wrap, yard, yard up