let up vs die away

let up and die away both are verbs.

Word	Noun	Adjective	Verb	Adverb
let up	No	No	Yes	No
die away	No	No	Yes	No

As verbs, let up and die away are synonyms defined as:

Other synonyms of let up include abate, slack, slack off.

let up (verb)	die away (verb)
become less in amount or intensity	become less in amount or intensity
reduce pressure or intensity