Verb seal off has 2 senses
  1. seal, seal off - make tight; secure against leakage; "seal the windows"
    --1 is one way to close, shut
    Sample sentence:
    They want to seal off the doors
  2. blockade, seal off - impose a blockade on
    --2 is one way to besiege, beleaguer, surround, hem in, circumvent
    Sample sentence:
    Somebody ----s something
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