Simple past tense and past participle of grok.(verb)
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Use "grokked" in a sentence
"And while the MagicMouse can be picked up and grokked nearly instantaneously (though it sucks that right-click is disabled by default), the OpenOfficeMouse requires about two days of acclimation according to the FAQ."
"I had, of course, come across the text before and not really grokked it."
"More than learning craft, I think I grokked styles, ways to be a writer."