cross (one's) t's

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cross (one's) t's

To do something carefully and make sure that every last minor detail is completed. Please make sure to cross your t's when signing this contract. I made sure to cross my t's when installing the circuit breaker—you can never be too careful with electrical work.
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Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

cross (one's) t's

To be thorough or painstaking in attending to details.
See also: cross
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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