Fix firmly:
— He ensconced himself in the chair.

synonym: settle.

Roget 528: conceal, hide, secrete, put out of sight; lock up, seal up, bottle up.    encrypt, encode, cipher.    cover, screen, cloak, veil, shroud; cover up one's tracks; screen from sight, screen from observation; drawing the veil; draw the curtain, close the curtain; curtain, shade, eclipse, throw a view over; be cloud, be mask; mask, disguise; ensconce, muffle, smother; befog; whisper.    keep from; keep back, keep to oneself; keep snug, keep close, keep secret, keep dark; bury; sink, suppress; keep from, keep from out of view, keep from out of sight; keep in the shade, throw into the shade, throw into background; stifle, hush up, smother, withhold, reserve; fence with a question; ignore etc. 460.    keep a secret, keep one's own counsel; hold one's tongue etc. (silence) 585; make no sign, not let it go further; not breathe a word, not breathe a syllable about; not let the right hand know what the left is not let the right hand know what the left is doing; hide one's light under a bushel, bury one's talent in a napkin.    keep in the dark, leave in the dark, keep in the ignorance; blind, blind the eyes; blindfold, hoodwink, mystify; puzzle etc. (render uncertain) 475; bamboozle etc. (deceive) 545.    be concealed etc. v.; suffer an eclipse; retire from sight, couch; hide oneself; lie hid, lie in perdu [Fr.], lie in close; lie in ambush (ambush) 530; seclude oneself etc. 893; lurk, sneak, skulk, slink, prowl; steal into, steal out of, steal by, steal along; play at bopeep^†, play at hide and seek; hide in holes and corners; still hunt.    ... show more

Roget 664: be safe etc. adj.; keep one's head above water, tide over, save one's bacon; ride out the storm, weather the storm; light upon one's feet, land on one's feet; bear a charmed life; escape etc. 671.    make safe, render safe etc. Adj.; protect; take care of etc. (care) 459; preserve etc. 670; cover, screen, shelter, shroud, flank, ward; guard etc. (defend) 717; secure etc. (restrain) 751; entrench, intrench^†, fence round etc. (circumscribe) 229; house, nestle, ensconce; take charge of.    escort, convoy; garrison; watch, mount guard, patrol.    make assurance doubly sure etc. (caution) 864; take up a loose thread; take precautions etc. (prepare for) 673; double reef topsails.    seek safety; take shelter, find shelter etc. 666.    ... show more

Dutch: verschansen