There are 2 definitions of -ish in English:

-ish1

suffix

  • Forming adjectives:
  • 1(From nouns) having the qualities or characteristics of: apish girlish
  • 1.1Of the nationality of: Swedish
  • 2(From adjectives) somewhat: yellowish
  • 2.1 informal Denoting an approximate age or time of day: sixish

Origin

Old English -isc, of Germanic origin; related to Old Norse -iskr, German and Dutch -isch, also to Greek -iskos (suffix forming diminutive nouns).

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody

There are 2 definitions of -ish in English:

-ish2

suffix

  • Forming verbs such as abolish, establish.

Origin

from French -iss- (from stems of verbs ending in -ir), from Latin -isc- (suffix forming inceptive verbs); compare with -ish1.

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Definition of -ish in: