What is "to hem in"

Hem \Hem\, v. t. [imp. & p. p. Hemmed; p. pr. & vb. n. Hemming.]

1. To form a hem or border to; to fold and sew down the edge of.
   --Wordsworth.

2. To border; to edge

   All the skirt about Was hemmed with golden fringe.
   --Spenser.

   To hem about, To hem around, or To hem in, to inclose and confine; to surround; to environ. ``With valiant squadrons round about to hem.''
   --Fairfax. ``Hemmed in to be a spoil to tyranny.''
   --Daniel.

   To hem out, to shut out. ``You can not hem me out of London.''
   --J. Webster.