the.com/until

The word that holds a door open right up to the moment it slams.

means Up to a particular point in time, after which the thing stops or changes.

from A medieval mashup of Old Norse 'und' (as far as) glued onto 'till' — making 'till' twice over, redundantly insistent.

Secretly redundantThe 'un-' already means the same as 'till'.
Not 'not'That prefix isn't the negative 'un' at all.
Spelling trapOne L, despite 'till' having two.
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