english
1
general::
Phrase(s): *a rough idea (about something) [and] *a rough idea (of something) a general idea; an estimate. (*Typically: get ~; have ~; give someone ~.) • I need to get a rough idea of how many people will be there. • I’ll manage to get a rough idea. That’s good enough.
McGrawhill's American Idioms And Phrasal Verbs