to a T

• down to a T (emphatic)
• to a tee

The origins of this phrase are uncertain, but it has been observed in print since at least 1693,[1] and likely was around well before that. The potentially related phrase to a tittle is found in a 1607 play, The Woman Hater by Francis Beaumont and John Fletcher ("I'll quote him to a tittle"). The T in the phrase to a T is likely the first letter of a word, with tittle being the most likely source.

• Other theories with little evidence point to golf tees, for their small size; this may have at least influenced the alternate form to a tee. Some speculate a relationship with T-square, a measuring device introduced around the turn of the century. Others claim the expression refers to the correct completion of the letter t by crossing it.
• In print from "Two Years Before the Mast" published in 1840, and, even then, using quotes, refers to the practice of squaring up a yardarm with a mast on a sailing ship such that it made a perpendicular T.

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to a T

1. (idiomatic) Precisely; exactly; perfectly; with great attention to detail.

   The announcement of the political endorsement was timed to a T.

   • 1759–1767, [Laurence Sterne], The Life and Opinions of Tristram Shandy, Gentleman, volume (please specify |volume=I to IX), London: […] T. Becket and P. A. Dehondt, […]:

     I hope your Honour will be soon well enough to get down to your country-seat, where,—as your Honour takes so much pleasure in fortification, we could manage this matter to a T.

   • 1766, George Colman; David Garrick, The Clandestine Marriage, a Comedy. […], London: […] T. Becket and P. A. De Hondt, […]; R[oberts] Baldwin, […]; R. Davis, […]; and T[homas] Davies, […], OCLC 1154871270, Act III, scene ii, page 49:

     My ſpurrit to a T—My dear child!

   • 1868, Ann Sophia Stephens, Doubly False:

     That accounts for my having the dress, but it don't account for the piece that you left sticking to the rose-bush under Mrs. Lander's bed-room winder, which piece I took off that morning, and which piece I matched with the dress after you pitched it at me over them bannisters; it was an awful scragly tear, and it fitted to a T.

   • 1979, “Rapper’s Delight”, performed by Sugarhill Gang:

     You see I'm six foot one and I'm tons of fun and I dress to a tee

• Atto, atto-, tota