n. & v.
n. 1 a small body of still water, usu. of natural formation. 2 a small shallow body of any liquid. 3 = swimming-pool (see SWIM). 4 a deep place in a river.
v. 1 tr. form into a pool. 2 intr. (of blood) become static.
[ OE pol, MLG, MDu. pol, OHG pfuol f. WG ]