E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Rem Acu.
You have hit the mark; you have hit the nail on the head. Rem acu tetigisti (Plautus). A phrase in archery, meaning, You have hit the white, or the bulls-eye.
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Rem acu once again, said Sir Piercie.The Monastery, chap. xvi.