the.com/mistake
A decision that seemed brilliant right up until reality arrived.
means An action, judgment, or belief that turns out to be wrong, usually with consequences attached.
from From Old Norse mistaka, to take wrongly — literally grabbing the wrong thing, which is exactly what your hands and your judgment keep doing.
Built to learnThe brain fires extra signals after errors to adjust.
Latin cousinErrare, to wander, gives us error and erratic.
Costly typosA misplaced hyphen once doomed a NASA probe.