The phrase 'we double-checked' is correct and usable in written English.
You can use this phrase when speaking of confirming or verifying something that has already been checked. For example: "We double-checked the information before submitting our report."
We double-checked on Monday.
"We double-checked and got an e-mail from a programmer saying the crown prince had approved our participation".
We double-checked and adjusted, if necessary, all statistical tests in the manuscript.
Finally, we double-checked this finding by asking one more group of managers to describe their employees' behaviors with the final 13-item survey.
At one point during our discussions, we double-checked with Ion Trewin, the chair of the prize committee, if we could split it.
The night before, as we double-checked our bags to make sure we had formula and baby clothes, we received a photo of him, also by text.
In case you are wondering (we were), we have double-checked and these are the only two of Alphabet's robotics companies getting acquired by SoftBank.
It's just strange to hear it from someone – and we have double-checked this with the man himself – who has lived in London for almost 30 years but has his company, Ginola International, registered in Dublin because of the relevant tax perks.
We've double-checked with our sources, and have heard that Sequoia did not formally engage with Slack, and is not participating as we originally reported.
We have also double-checked the description of the supplemental figures in the legends.
In addition to using this program, we also manually double-checked all genotypes as an extra quality control step.
