Learn what "you should at least know this" means, when people say it, and how to use it naturally in English.

The speaker is saying the other person ought to know this already and sounds annoyed or judgmental.
From Love Lies And Bloodline, Episode 48
Someone is criticizing another person for not already knowing an important fact.
Use this when correcting someone, but it can sound rude or impatient. It is not a polite teaching phrase.
Scenes unlock real expressions as you watch
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