Etymology
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bullish (adj.)

1560s, "of the nature of a bull," from bull (n.1) + -ish; stock market sense "tending to advance in price" is from 1882. Related: Bullishly; bullishness.

updated on August 26, 2017

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Definitions of bullish from WordNet

bullish (adj.)
expecting a rise in prices;
From wordnet.princeton.edu, not affiliated with etymonline.