Answer: blunder

AnswerCrossword Clue
BLUNDER

"Oops!" evoker

BLUNDER

Gross error.

BLUNDER

Flounder.

BLUNDER
Faux pas.
BLUNDER
Be greatly mistaken.
BLUNDERMistake.
BLUNDERBungle.
BLUNDERMistake
BLUNDERFlub
BLUNDERStupid error
BLUNDERMake a mistake