in triplicate

in triplicate

In three copies. I need all of these forms in triplicate—can you get that together before my 3:00 meeting?
Farlex Dictionary of Idioms.

in triplicate

[of a document] produced in three copies. Mr. Smith asked me to copy his notes in triplicate. I completed each form in triplicate.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • on one's
  • on someone's
  • (I've) got to go
  • (Have you) been OK?
  • pillow-biter
  • out of one's
  • #dead
  • save someone's skin
  • (something) blows
  • other than (something)
References in periodicals archive
Would we then start issuing ballots in triplicate and concoct new, ever more complex algorithms?
Mitchell Wasserman, chief executive officer and cofounder of the company, said not only did freight forwarders previously have to use typewriters to prepare certificates of insurance on onionskin paper in triplicate, there was no control over what insuring terms were typed on the negotiable documents, presenting significant risks to insurers.
The totem in this quasi-fable is a wooden pole, which, at one point, reproduces itself in triplicate. The stick metamorphoses as each small group encounters it.
Test sample, standard, and control were added 20 [micro]L in triplicate in 96-well microplate.
All manuscripts should be submitted in triplicate. Where possible, a floppy disk, ideally in WordPerfect 5.1 or ASCII format should be sent.