slub, burl, gnarl, ravel, tangle, grayback, mi, air mile, nautical mile, mile, more...

untie, release, loosen, disentangle, unravel

square knot, bowline knot, clove hitch, fisherman's knot, half hitch, sheepshank, slip knot, more...

gordian, little, small, tight, top, hard, overhand, double, single, large, loose

makes a sheepshank,   tangle up,   lump in yarn,   lump in throat,   nautical measure,   bump on a tree,   lump in the throat,   knitting yarn lump,   hole's opposite,   he tied