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Meaning: a dysphemism for undocumented immigrants, refugees and asylum seekers
These illegal immigrants from Syria and Afghanistan will steal our jobs!
They're not illegal immigrants! They're refugees from war-torn countries who need our help.
Note: Also "illegal alien". For advanced learners: Often used to describe people who escape from war, persecution or poverty without being helped by a refugee agency or similar organization. The term "illegal immigrant" makes escaping from war, persecution or poverty independently sound like a crime, and most people and governments who use the term don't want to help these people.
Calling refugees "illegal immigrants" makes them sound like