work like a charm Definition

charm
noun

1. The power of delighting, attracting or fascinating.

Thesaurus: grace, attraction, desirability, allure, charisma, appeal, attractiveness.
2. Delightful qualities possessed by a person, place, thing, etc.

Form: charms
3. An object believed to have magical powers.

Thesaurus: talisman, fetish, mascot, good-luck piece (US), amulet.
4. A magical saying or spell.
5. A small ornament, especially of silver, worn on a bracelet.

verb charmed, charming

1. To delight, attract or fascinate someone.

Thesaurus: entertain, please, delight, beguile, enchant, captivate, possess, enthrall, transport, mesmerize, entrance, bewitch, dazzle, win over, vanquish.
2. To influence or persuade them by charm.

Form: charm someone into something (usually)
Form: charm someone out of something

Derivative: charmless
adj

Derivative: charmlessly
adverb

Idiom: work like a charm

To produce the desired result as if by magic.

Etymology: 13c: French charme, from Latin carmen song or spell.