More chick-like; more resembling or characteristic of a young chicken, or comparative form in dialectal use.
Comparative form of 'chick' used as an adjective, adding the '-er' suffix. This appears to be a rare dialectal or informal usage, not standard in modern English.
Chicker is grammatically possible but almost never used in real English—people say 'younger' or 'more chicken-like' instead—which shows that English speakers have strong intuitions about which comparative forms actually sound natural.
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