ate

Probably a remodelling of earlier eat by analogy with other strong verbs such as break:†brake, give:gave, speak:†spake; compare the same process in rare Middle English at (“ate”) besides more usual et.

However, the pronunciation /ɛt/ likely continues Middle English et, from Old English ǣt, from Proto-West Germanic *āt, from Proto-Germanic *ēt, with shortening as in e.g. thread.

Borrowed from Tagalog ate (“elder sister”), from Hokkien 阿姊 (á-ché, “eldest sister”).