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Definition of fasten : 1. To cause to hold together or to something else; to attach or unite firmly; to cause to cleave to something , or to cleave together, by any means; as, to fasten boards together with nails or cords; to fasten anything in our thoughts.
2. To cause to take close effect; to make to tell; to lay on; as, to fasten a blow.
3. To fix firmly; to make fast; to secure, as by a knot, lock, bolt, etc.; as, to fasten a chain to the feet; to fasten a door or window.
4. To fix one's self; to take firm hold; to clinch; to cling.

Synonyms:

reduce, clip, hook, prepare, screw, restrict, infix, impute, solder, insure, shackle, doctor, bed, nail, assure, procure, get, clamp, give, catch, desexualise, blame, desexualize, stiffen, situate, hold fast, grasp, desex, set, fetter, bar, unsex, embed, fixate, furbish up, restore, engage, assemble, keep, ingrain, pin on, combine, restrain, harness, compel, sterilize, stop up, pay off, deposit, anchor, clasp, tie down, place, mend, hold, pay back, shutter, repair, wedge, ready, ensure, sterilise, tighten, grapple, lodge, posit, gear up, oblige, strengthen, fix, entrench, plug, button, tighten up, assign, root, touch on, constrain, batten, batten down, rivet, determine, bushel, define, cinch, clutch, set up, specify, entangle, loosen, cook, pin, tie up, moor, twist, release, move, make, grip, limit, guarantee

attach (part of speech: verb)

bond, hitch, adhere, merge, relate, join, bind, couple, stick, affix, cling, juxtapose, splice, attach, marry, wed, annex, abut, connect

fasten (part of speech: verb)

cement, lash, lace, paste, knit, suture, glue, plait, link, stitch, tether, fuse, weld, string, baste, stay, chain, zip, strap, clinch, buckle, bracket, tack, tie, sew, weave, hinge, braid, knot

close (part of speech: verb)

close, block, shut, latch, secure, lock, bolt, seal, jam, barricade, stop

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