Read the word off its parts: bear plus -ish, having something of a bear about it. The plain picture is the animal - big, heavy, gruff. The money senses use the same ending on a different bear, the one that stands for 'down' on the trading floor, and our evidence does not record how that bear got there, so treat the link as a way to remember the direction rather than a claim about where the word came from.
bearish 可以拆開來看：bear（熊）加 -ish（有點像…的）。最直白的畫面就是一隻熊：塊頭大、動作重、講話粗。-ish 這個字尾很常見，像 childish、reddish，意思都是「帶點那個味道」。財經新聞裡的 bear 則是市場上那隻代表「往下」的熊。我們手上的資料沒有說明動物怎麼變成看跌的記號，所以那條線只能當成方便記憶的畫面，不算字源。
From the word’s history
Wiktionary gives the formation as bear + -ish. That accounts for the adjective ending only; it does not explain the stock-market use.
資料記載的組成是 bear + -ish，說明的只是形容詞怎麼造出來，並沒有交代股市用法的來源。
Wiktionary, "bearish"
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