Merriam-Webster's Word of the Day for July 3, 2026 is:

corrode • \kuh-ROHD\  • verb

Corrode means "to slowly break apart and destroy (metal, an object, etc.) through a chemical process" or "to undergo such a process." It is also used as a synonym of undermine to mean "to gradually destroy or weaken."

// Several sections of the pipe have corroded and will need to be replaced.

// Years of lies and secrets had corroded their relationship.

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Examples:

"Each piece is made of durable steel with a powder coating that won’t rust, fade, or corrode in the weather." — Shea Simmons, Southern Living, 29 Apr. 2026

Did you know?

Corrode comes from the Latin verb corrōdere, meaning "to gnaw or chew up." Corrōdere, in turn, combines the prefix cor- (used here as an intensifier with the meaning of "completely") with the verb rōdere ("to gnaw"). (You may recognize another rōdere descendent, rodent, as a word for members of an order of gnaw-happy mammals.) At one time, corrode was used to literally indicate the action of gnawing away, as in "woodworms corroded the wood." But it is the more figurative senses from the action of gnawing or eating away that have persisted, as in "salt water corroded the iron" or "a lack of transparency by local officials is corroding public trust."