An evil spell or curse.
"The player moved their piece to an empty hex on the board, advancing closer to the finish line."
Clipping of hexadecimal.
A hexagonal space on a game board.
In plain English: A hex is an evil spell used to curse someone and make them misfortune happen.
"The old house has an eerie hex over it that makes everyone feel uneasy when they enter."
To cast a spell on (specifically an evil spell), to bewitch.
"The old witch decided to hex her rival by cursing their harvest with blight."
In plain English: To hex someone means to use magic spells to curse them and cause bad luck.
"The old woman claimed she hexed the cat to bring bad luck to anyone who touched her bowl."
Usage: Use the verb form of hex when you mean to curse or bewitch someone with magic, as it specifically implies causing harm rather than just casting any kind of spell. Avoid confusing this magical meaning with its noun definition referring to a six-sided tile in strategy games like Settlers of Catan.
of or pertaining to a number system having 16 as its base
"The hex code #FF5733 represents a vibrant shade of orange in the digital design software."
The word "hex" entered American English around 1830 from Pennsylvania German hexe, originally meaning "to practice witchcraft." Its usage as a noun for the act itself appeared shortly after in the 1850s, sharing roots with related words like Dutch heks and Old English hægtesse.