Plural of charmer; people who are delightfully attractive or persuasive, or people who enchant animals (like snake charmers).
From charm + -er (one who charms). Snake charmers were called this by 17th-century European travelers to India and the Middle East.
Snake charmers don't actually use magic—snakes are deaf and respond to vibrations and the charmer's swaying movements, but the mystique made them famous circus attractions in the 1800s!
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