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I don't understand what that phrase tries to express:

"to take 20 until you beat an impossible DC"

- 20 of what? - acronym DC?

If it's a language idiom, could someone translate it to something that is comprehensible for a larger audience, please?

This is a term from D20 roleplaying games. Taking 20 on a skill check (which is only possible under certain circumstances) gives you a straight +20 bonus without the need to roll dice. The quote alludes to the possiblity of compounding these bonuses to beat checks with arbitrarily high DCs (Difficulty Class). 20:24, 20 August 2015 (UTC)