to tranquilize or calm, as a person or the feelings; relieve, comfort, or refresh:
soothing someone's anger; to soothe someone with a hot drink.
to mitigate, assuage, or allay, as pain, sorrow, or doubt:
to soothe sunburned skin.
verb (used without object), soothed, soothing.
to exert a soothing influence; bring tranquillity, calm, ease, or comfort.
before 950;Middle Englishsothen to verify, Old Englishsōthian, equivalent to sōthsooth + -ian infinitive suffix; Modern English sense shift “to verify” > “to support (a person's statement)” > “to encourage” > “to calm”
O.E. soðian "show to be true," from soð "true" (see sooth). Sense of "quiet, comfort, mollify" is first recorded 1697, on notion of "to assuage one by asserting that what he says is true" (i.e. to be a yes-man), a sense attested from 1568.