dawdle vs drop behind

dawdle and drop behind both are verbs.

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

As verbs, drop behind is a hyponym of dawdle; that is, drop behind is a word with a more specific, narrower meaning than dawdle:

dawdle: hang (back) or fall (behind) in movement, progress, development, etc.
drop behind: to lag or linger behind

Other hyponyms of dawdle include drag, drop back, get behind, hang back, trail.

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