formalise
1. 使...正式化;形成某种形式：1-11 vertical 垂直的,垂直性的 | 1-12 formalise 使...正式化;形成某种形式 | 1-12 transportation 运输
1. India and Pakistan already have an informal understanding to notify each other before missile tests but have been seeking to formalise it.
verb
1. declare or make legally valid
Synonym: validate formalize
2. make formal or official
e.g. We formalized the appointment and gave him a title
Synonym: formalize