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Italian word subito comes from Latin ire, Latin sub, and later Latin subitus (Sudden. Unexpected.)
ire (Latin)
sub (Latin)
(with ablative) about, around (time). (with ablative) at the feet of. (with ablative) behind. (with ablative) under, beneath. (with ablative) within, during. (with accusative) under, up to, up under, close to (of a motion). (with accusative) until, before, up to, about.
subire (Latin)
subitus (Latin)
Sudden. Unexpected.
subito (Italian)
As soon as possible. At once, immediately. Forthwith. Instantly. Now. Right away. Straight away. Without delay.