Source : Webster's Revised Unabridged Dictionary (1913)

Snag \Snag\, v. t. [imp. & p. p. {Snagged}; p. pr. & vb. n.
   {Snagging}.]
   1. To cut the snags or branches from, as the stem of a tree;
      to hew roughly. [Prov. Eng.] --Halliwell.

   2. To injure or destroy, as a steamboat or other vessel, by a
      snag, or projecting part of a sunken tree. [U. S.]

Source : WordNet®

snag
     n 1: a sharp protuberance
     2: a dead tree that is still standing, usually in an
        undisturbed forest; "a snag can provide food and a habitat
        for insects and birds"
     3: an opening made forcibly as by pulling apart; "there was a
        rip in his pants"; "she had snags in her stockings" [syn:
        {rip}, {rent}, {split}, {tear}]
     4: an unforeseen obstacle [syn: {hang-up}, {hitch}, {rub}]
     v 1: catch on a snag; "I snagged my stocking"
     2: get by acting quickly and smartly; "snag a bargain"
     3: hew jaggedly
     [also: {snagging}, {snagged}]

snagging
     See {snag}