Relieve, soothe (5)
I believe the answer is:
allay
I believe this is a double definition.
'relieve' is the first definition.
(I know that relieve can be written as allay)
'soothe' is the second definition.
(I know that allay is a type of soothe)
(Other definitions for allay that I've seen before include "Calm fears" , "Diminish (fears/concern)" , "Diminish or end (fears)" , "Relieve, soothe" , "Marks of blows" .)