black·mail
/ˈblakˌmāl/
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noun
the action, treated as a criminal offense, of demanding payment or another benefit from someone in return for not revealing compromising or damaging information about them.
"they were acquitted of charges of blackmail"
synonyms: extortion, demanding money with menaces, exaction, intimidation; More
verb
demand money or another benefit from (someone) in return for not revealing compromising or damaging information about them.
"trying to blackmail him for $400,000"
synonyms: extort money from, threaten, hold to ransom, milk, bleed; informaldemand hush money from
"he was going to blackmail the murderers"