Words that have come to mean the opposite of their original intent

Do you use the word yakubusoku when a task is too heavy for you? Or do you use it when a task is too light?

I used to use it when a task was too heavy for me, but it turns out the original meaning is for when a task is too light, or when a more important role would be more appropriate.

The word kakushinhan, which is used to mean doing something while knowing it is wrong, originally meant doing something because you believe it is right.

They have become the exact opposite. There are more.

Nasake wa hito no tame narazu is something I used to think meant showing kindness does not benefit the other person, but it actually had a positive meaning, like it benefits not only the other person but also yourself.

Tariki hongan is something I thought meant relying on others without doing anything yourself, but this is a Jodo Shu Buddhist term meaning relying on the power of Amida Buddha to attain enlightenment.

Kosoku is used to mean cowardly or underhanded methods, but it actually means a stopgap measure.

Shikii ga takai is often used when a place is too high-class to enter, but it originally seems to be used when it is difficult to visit because you have caused trouble there in the past.

Shissho is used to mean sneering or being unable to laugh out of amazement, but it originally seems to mean bursting into laughter unintentionally.

There are still more.

Sawari is used to mean the beginning of a story, but it originally means the main point of a story.

Shiodoki is thought to mean the time to withdraw, but it actually means the best timing.

Nashikuzushi is thought to mean proceeding with things vaguely, but it actually means clearing things up little by little.

This one is easy to get wrong!
Amamoyou is thought to mean it is raining, but it is actually a word used when it looks like it is about to start raining.

Tenchi muyo does not mean it is okay to turn it upside down, but rather do not turn it upside down. It would be a disaster if you got that wrong.

There are also words used by young people where the meaning has reversed.

Yabai originally meant dangerous or bad, but recently it is also used to mean amazing or awesome!

Kimoi is thought to mean gross, but it seems it is also used when something is strange and incomprehensible.

Kurorekishi was apparently a term from Mobile Suit Gundam referring to erased records, but it is now used to mean embarrassing experiences from the past.

Jikoru has come to be used not only for causing a traffic accident, but also for failing or messing up.

So why have these words come to be used in ways that differ from their original meanings?

For example, terms like "yakubusoku" (insufficient role) and "kakushinhan" (crime committed with conviction) are easily misunderstood based on their appearance—the former as "not enough of a role" or "too difficult for me," and the latter as "being convinced" or "doing something on purpose."

In the case of "kosoku" (expedient), the pronunciation sounds like "koso-koso" (sneaky), and the meaning seems to have shifted due to the impression of the sound.

Words like "yabai" (dangerous/awesome) and "kuro-rekishi" (dark history) are examples where the meanings have evolved dramatically over time.

Metaphorical usages like "jikoru" (to have an accident) are cases where interesting phrasings or slang used in media were accepted by many people.

I recall a linguist once saying, "Language evolves with the times; even incorrect usage becomes the meaning once it takes root."

Therefore, these usages are not mistakes; rather, the meanings change and evolve with the times, and eventually, they become the correct meanings.

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