dot i's

dot (one's) i's

To be thorough or painstaking in attending to details.
See also: dot
References in periodicals archive ?
Everybody wants to dot i's and cross t's and you notice the wine is still sitting there but they've just asked me to be a little careful while they're under great scrutiny and I'm happy to do that.
The failure of the SC Bodner Company to build accessible housing units is more than a failure to cross T's and dot I's.