Learn what "we both have a hand in it" means, when people say it, and how to use it naturally in English.

It means both people are partly responsible for the situation.
From Under Her Control, Episode 11
The speaker is admitting that both people share responsibility for what happened.
Use this when sharing blame or discussing mutual responsibility. It is idiomatic and useful, but it is less likely to be searched as a fixed phrase than simpler alternatives.
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