oncome
To arrive; come to; come on.
intransitive, rare
This said, and shaking his long dark spear, then forward he hurl'd it Into the fullround buckler of Priamides Alexander; Right thro' his glittering shield oncame the redoubtable warspear, On still advanced, throughpiercing his breastplate's various-art-work [...]
Where it comes from
From Middle English oncomen, from Old English oncuman, ancuman (“to arrive, come upon, happen”), from Proto-Germanic *anakwemaną (“to come to, come at, arrive”), equivalent to on- + come. Cognate with Dutch aankomen (“to arrive”), German ankommen (“to arrive”), Swedish ankomma (“to arrive”).
Adapted from the Wiktionary entry oncome (CC BY-SA 4.0).