lull sb into a false sense of security

lull sb into a false sense of security
lure sb into a false sense of security
give sb a false sense of security
(to make someone feel safe when they are not; to make someone feel deceptively secure or confident; to lead someone into believing that all is well before attacking or doing someone bad; to cause to relax vigilance) — усыплять бдительность, притуплять бдительность; внушить ложное чувство безопасности

lull the enemy into a false sense of security — усыплить бдительность врага

Example 1: The rarity of earthquakes there has lulled people into a false sense of security.

Example 2: We lulled the enemy into a false sense of security by pretending to retreat. Then we launched an attack. (thefreedictionary.com)

Example 3: Wearing suntan lotion can lull people into a false sense of security and make them spend longer in the sun than they should. (thefreedictionary.com)

Example 4: The boss lulled us into a false sense of security by saying that our jobs were safe and then let half the staff go.(thefreedictionary.com)

Example 5: While there may be periods of marked improvement, which often lull the patient and concerned relatives into a false sense of security (with the patient thinking ‘I can take it or I can leave it’), it is important to recognize that a relapse is unavoidable.

Example 6: Whether the experience of the cyclist riding the hire bike is a factor we don't know. We also don't know yet if the painted blue lane of the Cycle Superhighway lulled the cyclist into a false sense of security.

Example 7: Test scores and league tables lure parents into a false sense of security. Just because a child does okay in (limited and proscriptive) tests, doesn't always mean that all is well with their state of learning.