Somewhat clammy or having qualities similar to clams; damp and sticky.
From 'clam' or 'clammy' plus the suffix '-ish' (meaning somewhat, like 'reddish' or 'foolish'). A rare or informal formation.
The suffix '-ish' is wonderfully flexible in English—it lets speakers create on-the-fly descriptions, which is why children naturally say things like 'It's greenish' or 'He's being clammish' without formal instruction.
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