close off
Verb
Meaning
block off the passage through
isolate or separate
stem the flow of
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Examples
In life, when stuff happens the instinct is to close off your heart. By leaving your heart open, it leaves room for someone else to come in.
Scepticism is a necessary and vital part of the journalist's toolkit. But when scepticism becomes cynicism it can close off thought and block the search for truth.
We shut off the valve
She was shut off from the friends
shut off the gas when you leave for a vacation
Above: The former staircase connected all three floors, but Celia and Rodolphe opted to close off access to the garden floor and create two separate units.