2 sentences for 违约 (wéi​yuē)

1. 既然签署了协议，双方都不得违约。

   jì​rán qiān​shǔ le xié​yì, shuāng​fāng dōu bù dé wéi​yuē.

   Since the agreement is signed, neither party may breach the contract.

   Source: Dong Chinese Dictionary

2. 该公司因无法按时偿还债务而构成违约。

   gāi gōng​sī yīn wú​fǎ àn​shí cháng​huán zhài​wù ér gòu​chéng wéi​yuē.

   The company went into default because it could not repay its debts on time.

   Source: Dong Chinese Dictionary