A verb-adverbial composite consists of two words. The first one is a verb, and the second is an adverbial like up, down, in, out, and over. There are two kinds of verb-adverbial composites, ****ly intransitive and transitive
Transitive come across [find], let down [disappoint], tell off [rebuke]
Intransitive catch on [understand], crop up [occur], give in [yield]
Intransitive
The witness turned up on time.