close off
v 1: stem the flow of; "shut off the gas when you leave for a
vacation" [syn: {shut off}, {close off}]
2: isolate or separate; "She was shut off from the friends"
[syn: {shut off}, {close off}]
3: block off the passage through; "We shut off the valve" [syn:
{shut off}, {block off}, {close off}]