Vous avez cherché: calavano (Italien - Anglais)

gli uccelli rapaci calavano su quei cadaveri, ma abram li scacciava.
the birds of prey came down on the carcasses, and abram drove them away.

e' così che i ricercatori hanno verificato che i livelli di hiv calavano quando le persone erano state curate con il valaciclovir.
the researchers found that when the patients took valacyclovir, their blood hiv levels declined significantly.

riconoscere un bravo era facile: a parte la faccia che metteva paura solo a guardarla, a parte l'armamentario di coltellacci, spadoni e tromboni (ovvero schippi, fucilacci grandi come cannoni) che tenevano addosso, avevano i capelli racolti in una reticella per non far vedere un enorme ciuffo che, quando dovevano commettere qualche birbonata, si calavano sul viso, in modo che nessuno potesse riconosceli.
it was easy to recognize a guard man: apart from the face that was frightening just by looking at him, apart from the armoury of of knives, broadswords and trombones (i.e. schippi, rifles as big as cannons) that they were wearing, they had their hair gathered in a net so as not to show a huge tuft that, when they had to commit some mischief, they lowered on their faces, so that no one could recognize them.