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Wiktionary
block off

vb. (context transitive English) To obstruct

WordNet
block off
  1. v. obstruct access to [syn: blockade]

  2. render unsuitable for passage; "block the way"; "barricade the streets"; "stop the busy road" [syn: barricade, block, blockade, stop, block up, bar]

  3. block off the passage through [syn: shut off, close off]

Usage examples of "block off".

Aunt Audrey was able with Seth's help to block off her mind sometimes, but never the steady pulse of that mind's existence.