I.e. "mistake"; It Was an __!

This page is the CodyCross answer for the clue below from Department Store, Group 518, Puzzle 1 (Good Discounts).

Question is: I.e. "mistake"; It Was an __!

and the answer is: ACCIDENT

Word Meaning:

ACCIDENT — An unexpected event with negative consequences occurring without the intention of the one suffering the consequences, and (in the strict sense) not directly caused by humans.

Definitions from Wiktionary.

I.e. "mistake"; it was an __! — CodyCross Answer | CodyCross Solutions