Carling float, air, asphyxiate, balsa, balsa raft, bar, bark, bedarken, besmirch, bind, black, blacken, blackwash, block, block up, blockade, blot, blotch, bob, bonnet, boom, bottle up, box up, bubble, bung, buoy, cage, cap, caulk, ceil, censor, chaff, charcoal, check, check valve, chink, chip, choke, choke off, choke up, clamp down on, clog, clog up, cloister, cobweb, cock, coif, confine, congest, constipate, constrain, coop, coop in, coop up, cork up, cortex, cover, crack down on, crib, crown, crush, dam, dam up, damp down, darken, denigrate, detain, dinge, dome, down, drown, dust, ebonize, encage, enclose, epicarp, ether, extinguish, fairy, faucet, feather, fence in, fill, fill up, float, flue, fluff, foam, foul, froth, fuzz, gag, gossamer, hat, hem in, hold, hold down, hold in, hold in custody, hold in restraint, hood, immure, impound, inhibit, ink, jam, jump on, keep, keep down, keep in, keep in custody, keep in detention, keep under, kill, lid, life buoy, life preserver, life raft, lock in, maintain, melanize, mew, mew up, mote, murk, muzzle, nigrify, obstipate, obstruct, oversmoke, pack, peel, peeling, peg, pen, pen up, phellum, pin, plug, plug up, pontoon, pound, pour water on, preserve, put down, quash, quell, quench, raft, rail in, repress, restrain, restrict, retain, rind, roof, roof in, save, save up, sea cock, seal up, shackle, shade, shadow, shut down on, shut in, shut up, silence, sit down on, sit on, skin, smash, smirch, smoke, smother, smudge, smut, smutch, soot, spigot, spike, spile, spill, sponge, spume, squash, squelch, stanch, stay, stench, stifle, stop, stop up, stopgap, stopper, stopple, strangle, straw, stuff, stuff up, stultify, subdue, suffocate, suppress, surfboard, tap, thistledown, throttle, tip, top, valve, wall in