1. a cocktail made with gin and dry vermouth, typically garnished with a small onion instead of an olive
Usage: often capitalized when referring to the drink; cocktail/mixology term

Examples

• She ordered a Gibson at the bar.
• The bartender prepared a Gibson with a pearl onion garnish.
• A Gibson is similar to a martini but uses an onion instead of an olive.
• He preferred a Gibson to a traditional martini.
• The Gibson became popular in upscale cocktail lounges.