Video reference - Nicholas Shackel
The motte-and-bailey fallacy (named after the motte-and-bailey castle) is a form of argument and an informal fallacy where an arguer conflates two positions which share similarities, one modest and easy to defend (the "motte") and one much more controversial (the "bailey"). The arguer advances the controversial position, but when challenged, they insist that they are only advancing the more modest position. Upon retreating to the motte, the arguer can claim that the bailey has not been refuted (because the critic refused to attack the motte) or that the critic is unreasonable (by equating an attack on the bailey with an attack on the motte).
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“I don’t know what you mean by “glory,”” Alice said.-Lewis Carroll, "Through the Looking Glass" (Ch. VI)
Humpty Dumpty smiled contemptuously. “Of course you don’t—till I tell you. I meant “there’s a nice knock-down argument for you!’”
“But “glory” doesn’t mean “a nice knockdown argument,’” Alice objected.
“When I use a word,” Humpty Dumpty said in rather a scornful tone, “it means just what I choose it to mean—neither more nor less.”
“The question is,” said Alice, “whether you can make words mean different things.”
“The question is,” said Humpty Dumpty, “which is to be master—that’s all.”
Alice was too much puzzled to say anything; so after a minute Humpty Dumpty began again. "They've a temper some of them- particularly verbs: they're the proudest- adjectives you can do anything with, but not verbs- however, I can manage the whole lot of them! Impenetrability! That's what I say!"
