Resembling or having the qualities of a champion; showing courage, skill, and determination like a winner.
From champion + -like (Old English suffix -lic meaning 'of the form or nature of'). The suffix -like became productive in English to create adjectives describing similarity to the noun.
Creating '-like' adjectives is one of English's most flexible word-building tricks—you can make almost any noun into a descriptor by adding '-like,' which is why 'championlike' feels instantly understandable even if you've never seen it before.
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