dawdle vs fall behind

dawdle and fall behind both are verbs.

Word	Noun	Adjective	Verb	Adverb
dawdle	No	No	Yes	No
fall behind	No	No	Yes	No

As verbs, dawdle and fall behind are synonyms defined as:

dawdle and fall behind: hang (back) or fall (behind) in movement, progress, development, etc.

Other synonyms of dawdle include fall back, lag.

dawdle (verb)	fall behind (verb)
take one's time; proceed slowly	retreat
hang (back) or fall (behind) in movement, progress, development, etc.	hang (back) or fall (behind) in movement, progress, development, etc.
waste time