detain vs slow up

detain and slow up both are verbs.

Word	Noun	Adjective	Verb	Adverb
detain	No	No	Yes	No
slow up	No	No	Yes	No

As verbs, slow up is a hypernym of detain; that is, slow up is a word with a broader meaning than detain:

Other hypernyms of detain include decelerate, retard, slow, slow down.

detain (verb)	slow up (verb)
cause to be slowed down or delayed	lose velocity; move more slowly
stop or halt	cause to proceed more slowly
deprive of freedom; take into confinement	become slow or slower