1900. Century Magazine, quoted in Facts on File Encyclopedia of Word and Phrase Origins by Robert Hendrickson (New York: Facts on File Publications, 1987)).
Weasel words are words that suck all of the life out of the words next to them just as a weasel sucks an egg and leaves the shell.

Now, you can have universal training or you can have voluntary training, but when you use the word 'voluntary' to qualify the word 'universal', you are using a weasel word; it has sucked all the meaning out of 'universal'. The two words flatly contradict one another.

In scrapping HS2's eastern leg and descoping Northern Powerhouse Rail (NPR), Prime Minister Boris Johnson's frequent and unambiguous promises to build both have been exposed for the weasel words they were.

Now Sears looked down at the person fate had put closer to him than anyone else in the world, and knew that Ricky was thinking that he had weasel-worded his way out of the last question.

Weasel word

Meaning

Noun

Verb