yī​chuí​dìng​yīn

to have the final word

一锤定音 一錘定音 yī​chuí​dìng​yīn
to have the final word
Literally meaning to set the tone of a gong with a single hammer blow; used to describe making a final decision or a closing statement that settles a matter once and for all.

Frequency

Movie subtitles
0.210 per million appears in 0% of films
Written text
0.583 per million

Sources