grease one's palms

crime, criminal offence, criminal offense, law-breaking, offense, offence - (criminal law) an act punishable by law; usually considered an evil act; "a long record of crimes"

pay - give money, usually in exchange for goods or services; "I paid four dollars for this sandwich"; "Pay the waitress, please"

sop - give a conciliatory gift or bribe to

buy off, pay off - pay someone with influence in order to receive a favor