E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Acu tetigisti.
You have hit the nail on the head. (Lit., you have touched it with a needle.) Plautus (Rudens, v 2, 19) says, “Rem acu tetigisti;” and Cicero (Pro Milne, 24) has “Vulnus acu punctum,” evidently referring to a surgeon’s probe.
ne, 24) has “Vulnus acu punctum,” evidently referring to a surgeon’s probe.
