encroachment
  侵蝕,侵犯
  En·croach·ment n.
  1. The act of entering gradually or silently upon the rights or possessions of another; unlawful intrusion.
     An unconstitutional encroachment of military power on the civil establishment.   --Bancroft.
  2. That which is taken by encroaching on another.
  3. Law An unlawful diminution of the possessions of another.
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  encroachment
       n 1: any entry into an area not previously occupied; "an invasion
            of tourists"; "an invasion of locusts" [syn: invasion,
             intrusion]
       2: entry to another's property without right or permission
          [syn: trespass, violation, intrusion, usurpation]
       3: influencing strongly; "they resented the impingement of
          American values on European culture" [syn: impingement,
          impact]