Webster's English Dictionary

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intrude

in.trude \in-'tru:d\ vb [L intrudere to thrust in, fr. in- + trudere to 
   thrust - mo]re at THREAT 1: to thrust oneself in without invitation, 
   permission, or welcome  2: to enter as if by force  1: to thrust or force 
   in or upon esp. without permission, welcome, or fitn ess 2: to cause to 
   enter as if by force  - in.trud.er n