follow something ↔ up phrasal verb ( see also ↑ follow )
1 . to find out more information about something and take action if necessary:
The police take people’s statements and then follow them up.
2 . to do something in addition to what you have already done in order to make it more likely to succeed ⇨ follow-up
follow something ↔ up with
If there is no response to your press release, follow it up with a phone call.
This experiment was quickly followed up by others using different forms of the drug.
⇨ ↑ follow-up