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Phrase(s): lull someone into a false sense of security
Cliché to lead someone into believing that all is well before attacking or doing someone bad. • We lulled the enemy into a false sense of security by pretending to retreat. Then we launched an attack. • The boss lulled us into a false sense of security by saying that our jobs were safe and then let half the staff go.
McGrawhill's American Idioms And Phrasal Verbs