The bow was an emblem amongst the Romans, and arcum tendere was equivalent to arrigere.
Again, we find in Petronius-- Astra igitur mea mens arcumdum tendit in ilia.
De Muro, where they use the term si arcum volserit, it cannot refer to vaulted roofs, which were then unknown, but to the slight arch of the window or door in the thickness of the wall, often only a sloping off of stones.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "arcum" in a variety of sentences. We hope that you will now be able to make sentences using this word.
