Both 妥 (ダ) and 協 (キョウ) use their on'yomi readings. 妥 is often mistaken for タ, but it's だ. The long vowel in きょう is essential; omitting it (だきょお) is a common pronunciation error. It means reaching a mutual agreement by giving up some demands.

妥協は妥(ダ)と協(キョウ)の音読みです。妥を「タ」と読む誤りが多いですが、「ダ」が正しいです。双方の主張を譲り合い、合意に達することを意味します。