to  dot  the i's and  cross  the t's
dot
dɒt
dot
the
ði
dhi
i's
aɪz
aiz
and
ənd
ēnd
cross
krɒs
kros
the
ðə
dhē
t's
tiz
tiz
[cross] {one's} t's and [dot] {one's} i's
[cross] the t's and [dot] the i's
[dot] {one's} i's and [cross] {one's} t's

Definition & Meaning of "dot the i's and cross the t's"in English

to dot the i's and cross the t's
01

to make sure no detail goes unnoticed in compeleting a task 

What is the origin of the idiom "dot the i's and cross the t's" and when to use it?

The origin of the idiom "dot the i's and cross the t's" can be traced back to the carefulness required in handwriting, particularly in the formation of letters. The phrase is mainly used to signifie the act of paying careful attention to small details, specifically the completion of all necessary tasks and ensuring that nothing is overlooked or left unfinished.

Examples
I made sure to cross my t's and dot my i's when installing the circuit breaker—you can never be too careful with electrical work. 
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