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1. Blocking entrance to and exit from seaports and harbours
   "the blockading ships prevented delivery of munitions"

1. Hinder or prevent the progress or accomplishment of
   - obstruct, block, hinder, stymie, stymy, embarrass
    
2. Render unsuitable for passage
   - barricade, block, stop, block off, block up, bar
    
3. Obstruct access to
   - block off
    
4. Impose a blockade on
   - seal off

See also: preventative, preventive

Type of: beleaguer, besiege, block, circumvent, close up, forbid, foreclose, forestall, hem in, impede, jam, obstruct, obturate, occlude, preclude, prevent, surround

Encyclopedia: Blockade