
Be lost on somebody
Subtlety Matters
The phrase often refers to nuanced details or humor failing to register with someone.

Her sarcastic tone was lost on her foreign guests.
Cultural Sensitivity
Be aware that cultural differences can cause things to be lost on people.

Local idioms were completely lost on the tourists.
Not Ignorance
It's not about someone's intelligence, but about their awareness or knowledge.

The reference to the local event was lost on the newcomer.
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