Past tense of gunkhole; anchored a boat in a small, out-of-the-way cove or anchorage to avoid other vessels.
From 'gunk' (possibly onomatopoetic or from slang) plus 'hole' (an opening or anchorage). Maritime slang from the early 20th century, used by sailors seeking shelter in obscure spots.
Gunkholes are the sailor's secret—these hidden little coves and anchorages are passed down through generations of boaters who want to avoid crowds, and the slang word perfectly captures the feeling of settling into some grungy little spot away from civilization!
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