One of the mysteries of the English language finally explained.
Strong concentrated espresso; a drink of this; = caffè ristretto.
1980s; earliest use found in The New York Times. Either from Italian espresso ristretto (rare), or independently from espresso + Italian ristretto, after caffè ristretto or its etymon Italian caffè ristretto.
espresso ristretto/ɛˌsprɛsəʊ rɪˈstrɛtəʊ/
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