Up to a particular time or event. It is used to show when something stops or when a change happens.
From Old Norse 'und' (as far as, up to) + Old English 'til' (to, until). The forms merged over centuries into the modern 'until'.
Until is a time boundary word—it draws a line on the timeline and says, 'this holds true up to here.' 'Stay in bed until 7' is really saying, 'From now, all the way up to 7, stay put.'
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