〜まで(して)
even; going as far as
Noun (+ particle) + まで · Verb て-form + まで
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Besides "until", まで means "even", stressing that something went further than expected: 家族にまでうそをついた, "he even lied to his family". It's stronger than も and often carries surprise or disapproval.
It follows a noun or a particle: 子どもにまで, 雷まで. The unexpected item is the extreme end of a list.
After a て-form, てまで means "going as far as doing": 借金してまで、車を買う必要はない, "there's no need to go as far as borrowing money to buy a car". The second half often questions whether it's worth it.
Compare さえ ("even"), which picks out the minimum; まで picks out the maximum, the furthest point.
Examples
家族にまでうそをついた。
He even lied to his family.
借金してまで、車を買う必要はない。
There's no need to go as far as borrowing money to buy a car.
子どもにまで笑われた。
Even the children laughed at me.
徹夜してまで、レポートを仕上げた。
I went as far as staying up all night to finish the report.
雨だけでなく、雷まで鳴り出した。
Not only rain, but thunder too, on top of everything.