Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Origin: Probably from the sound of someone singing to a baby

lull

1 verb
     
lull1 [transitive]
1 to make someone feel calm or as if they want to sleep:
The hum of the tyres on the road lulled her to sleep.
2 to make someone feel safe and confident so that they are completely surprised when something bad happens
lull somebody into (doing) something
The police lulled me into believing that they did not suspect us.
Earthquakes here are rare and this has lulled people into a false sense of security (=made people think they were safe when they were not).

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