(law) In English common law, a person who accuses a confederate; who commits approvement.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "approver" in a sentence
"Kenneth Ward, chief of policy and administration at the department, is listed as the "approver" for the Electroworld transactions, according to the receipts."
"The word 'approver' stuck in my gorge, as used by the Lord Chief Justice; for we looked upon an approver as a very low thing indeed."
"The frivolity of the screenplay in first half acquires seriousness when the hero turns 'approver', bashes up the baddies, helps the police nab a bunch of terrorists and recovers a large quantity of RDX explosive towards the climax."