The expression 'kagamibiraki' is also used occasionally to refer to the opening of a sake barrel by breaking its lid with a wooden hammer at a feast; however, the correct expression of this event is 'kagaminuki.'
これとは別に、祝宴などで酒樽の蓋を木槌で割って開けることを鏡開きと呼ぶ場合があるが、元来は鏡抜きが正しい表現である。