interloper


Concise Oxford English Dictionary © 2008 Oxford University Press:
interloper /ˈɪntələʊpə/
noun a person who interferes in another's affairs; an intruder.
– derivatives
interlope verb.
– origin C16: from inter- + -loper as in archaic landloper ‘vagabond’ (from MDu. landlooper).
'interloper' also found in these Oxford entries:

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