A person who gives money or gifts to someone to persuade them to do something dishonest or illegal.
From English 'bribe' plus the agent suffix '-er' (one who performs an action). Used since at least the 14th century to identify those who commit the act of bribery.
Interestingly, in legal systems worldwide, the 'briber' (the one offering money) and the 'bribee' (the one accepting) are often equally guilty, but society tends to blame the briber more—showing how language reflects our moral judgments.
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