Ish: How a suffix became an independent word
The canonical use of -ish is as a suffix meaning “approximately,” as in bluish, tallish, sixish, or even hungry-ish. This is the definition—the only definition—that you’ll find in Merriam-Webster, which notes that -ish derives from the Old English -isc, of Germanic origin, which in turn is related to similar such suffixes in Dutch (-isch) and Greek (-iskos).
For centuries now, -ish has been rather promiscuous in English, attaching to a wide variety of words and even phrases.
Source: Ish: How a suffix became an independent word, even though it’s not in all the dictionaries yet
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