1. finish the final details in something, ensure that all details are correct
Professional
Social
the deal is nearly done, we just need to dot the is and cross the ts
The idiom to 'dot the i's and cross the t's' is usually used to describe being at the end of a project or negotiation and to pay very close attention to the details. To 'dot the i's and cross the t's' means to be meticulous and make sure that nothing is out of place, this idiom is often used to talk about going over arrangements or contracts for something.