See lull, think "calm." It could be the noun form (like "the lull before the storm") or the verb: one can lull someone by calming them (as in lulling a baby to sleep with a lullaby).

The noun lull is often used in relation to a storm, but the term has a broader meaning as well. Lull can be used to describe any temporary period of calm or diminished activity, like the quiet time before the lunch rush in a restaurant or the brief period of tranquility before the doors open for a pre-Christmas sale. The word's verb form means "to soothe or to make someone feel relaxed." When used as a verb lull can turn deceptive, and it is often used to convey a false sense of security.

Definitions of lull

v make calm or still

calm, calm down, quiet, quieten, still, tranquilize, tranquillise, tranquillize
agitate, charge, charge up, commove, excite, rouse, turn on
cause to be agitated, excited, or roused
calm (someone, especially oneself); make quiet
appease, assuage, conciliate, gentle, gruntle, lenify, mollify, pacify, placate
cause to be more favorably inclined; gain the good will of
assure, reassure
cause to feel sure; give reassurance to
Type of:
comfort, console, solace, soothe
give moral or emotional strength to

v calm by deception

“Don't let yourself be lulled into a false state of security”
Type of:
calm, calm down, quiet, quieten, still, tranquilize, tranquillise, tranquillize
make calm or still

v become quiet or less intensive

“the fighting lulled for a moment”
calm down
Type of:
hush, hush up, quieten, shut up, silence, still
cause to be quiet or not talk

n a pause during which things are calm or activities are diminished

Type of:
break, intermission, interruption, pause, suspension
a time interval during which there is a temporary cessation of something

n a period of calm weather

“there was a lull in the storm”
Type of:
an absence of strong winds or rain

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