tag \tag\, n. probably akin to tack a small nail; cf. sw. tagg
   a prickle, point, tooth.
   1. any slight appendage, as to an article of dress; something
      slight hanging loosely; specifically, a direction card, or
      label.
      1913 webster

   2. a metallic binding, tube, or point, at the end of a
      string, or lace, to stiffen it.
      1913 webster

   3. the end, or catchword, of an actor's speech; cue.
      1913 webster

   4. something mean and paltry; the rabble. obs.
      1913 webster

   tag and rag, the lowest sort; the rabble. --holinshed.
      1913 webster

   5. a sheep of the first year. prov. eng. --halliwell.
      1913 webster
see also:
tag and rag