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Libby Dodd's avatar

Originally, around 1530, the phrase was far less obscure than it may seem today, because when it first started being used, it was directly related to a person having a cold, detached and emotionless manner (where “cold” used in this way is an older metaphor itself). The idea was that a person was so cold that his mouth was at a temperature at which butter wouldn’t melt.

Evolution of the phrase

Throughout time the phrase “butter wouldn’t melt in his mouth” evolved.

From cold and detached, it came to be used to refer to people who were prim and proper, who acted by society’s rules regardless of their own feelings about any situation. (This disregard for their feelings is where the cold, emotionless side of the phrase came into the equation). For the purpose of doing the socially-determined “right” thing, girls may have pretended to be modest and shy, or high society men and women may have pretended to be interested in politics or theatre or whatever society deemed as the “proper” things to be interested in.

This is where the confusion of this phrase began

The meaning of the phrase began to branch in two directions:

Butter wouldn’t melt in his mouth meaning “liar”:

Some people began associating the phrase with phony people in society who were putting on an act to fit in and be seen favorably. They lied about their true feelings and were therefore seen as insincere, liars or manipulators.

Butter wouldn’t melt in his mouth meaning “sweet and innocent”:

Other people focused on the “prim and proper” nature that was a result of ignoring personal feelings for the sake of fulfilling society’s expectations. Throughout much of history, it was the prim and proper thing, especially amongst young ladies, to appear sweet and innocent; hence this new meaning became attached to the “butter wouldn’t melt in her mouth” phrase.

When used in this sense however, there is often a negative twist on the phrase. When used to describe someone as sweet and innocent, it is almost always followed by a “but”.

A good example of this can be seen in William Makepeace Thackeray’s Pendennis (1850): “When a visitor comes in, she smiles and languishes, you’d think that butter wouldn’t melt in her mouth: [BUT] the minute he is gone, very likely, she flares up like a little demon, and says things fit to send you wild”.

Over time, some people have forgotten the “but” and have begun associating the phrase with genuine sweet innocence, even though this isn’t the strictly correct use of the original phrase.

In essence, both of these definitions have some truth to them, but both definitions only tell part of the whole story. The full story is that “butter wouldn’t melt in your mouth” only if you are at some level acting in a way which is cold and detached from your true emotions.

from whydoi.com

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Sheryl Smith's avatar

Butter wouldn't melt: I've always thought it meant someone could play it very cool, not showing what they are really up to or that someone is very uppity and aloof. Curious to see what others have to say!

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