Sooth is an old-fashioned word that means to calm or comfort someone.
When people are feeling upset or worried, they might use sooth as a verb to describe the act of making them feel better. For example, if a friend is having a bad day and you listen to them and try to reassure them, you could say "I'm going to try to soothe your worries away." Some people also use it when talking about music or poetry that has a calming effect - like saying "That lullaby really soothed my baby to sleep".
Truth.
True.
In truth; indeed.
