We don't have synonyms for open up on yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are gen up on.
"I would like to know your opinions on the new project."
°To have or express as an opinion.
"1658: But if (as some opinion) King Ahasuerus were Artaxerxes Mnemon [...], our magnified Cyrus was his second Brother -- Sir Thomas Browne, The Graden of Cyrus (Folio Society 2007, p. 166)"
"I would like to know your opinions on the new project."
°To have or express as an opinion.
"1658: But if (as some opinion) King Ahasuerus were Artaxerxes Mnemon [...], our magnified Cyrus was his second Brother -- Sir Thomas Browne, The Graden of Cyrus (Folio Society 2007, p. 166)"