The informal verb grok was an invention of the science fiction writer Robert A. Heinlein, whose 1961 novel Stranger in a Strange Land placed great importance on the concept of grokking. In the book, to grok is to empathize so deeply with others that you merge or blend with them.
to understand profoundly and intuitively
word origin in “Stranger in a Strange Land”
Heinlein's coining of the word grok—meaning literally “to drink” but more broadly “to understand profoundly and intuitively”—was later incorporated into English-language dictionaries.
grok
/ɡräk/
INFORMAL•US
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"because of all the commercials, children grok things immediately"
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"nestling earth couple would like to find water brothers to grok with in peace"
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