Gush

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late Middle English: probably imitative.

wiktionary

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From Middle English guschen, gusshen, gosshien, perhaps from Middle Dutch guysen(“to flow out with a gurgling sound, gush”) or Old Norse gusa(“to gush”), ultimately imitative.

Compare Old Norse geysa(“to gush”), German gießen(“to pour”), Old English ġēotan("to pour"; > English yote). Related to gust.

etymonline

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gush (v.)

c. 1400, "to rush out suddenly and forcefully" (of blood, water, etc.), probably formed imitatively in English or from Low German, or from or based on Old Norse gusa "to gush, spurt," from PIE *gus-, from root *gheu- "to pour," and thus related to geyser. Metaphoric sense of "speak in an effusive manner" first recorded 1873. Related: Gushed; gushing. The noun is 1680s, from the verb.