一錘定音 (jat1 ceoi4 ding6 jam1) — set the tune with one beat of the gong in Cantonese
jatˉ¹一ceoiˎ₄錘dingˍ₆定jamˉ¹音简 一锤定音
Mandarin Pinyin: yi4 chui2 ding4 yin1
Meaning of 一錘定音
nounset the tune with one beat of the gong
nounmake the final decision; give the final word