dot the i's and cross the t's  对细节一丝不茍

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dot 在此是动词，表『在⋯⋯上打个小点』。cross 也是动词，表『画横线』。dot the i's and cross the t's 字面上的意思是『写 i 时要画一点，写 t 时要画一横』，引申为『对细节一丝不茍』之意。

有家公司想和阿雄订购 300 个马桶。在拟定合约之前，老板特别嘱咐阿雄，千万别像上次那样，价钱后面多写了一个零。

Dot the i's and cross the t's to make sure nothing is wrong.

= Pay attention to every detail to make sure nothing is wrong.

= Do a double check to make sure nothing is wrong.

（做事要仔细谨慎，以确保一切正确无误。）