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Tap any rung for its meaning.
The B is a stepping stone — borrowed at rung 1 to keep barks a real word, then given back at rung 3. There may be several par routes — the census above shows which ones climbers actually took.
A visible sign, spot, or symbol on a surface.
Mark comes from an Old English word meaning a boundary sign or trace. It is related to similar words in German and Old Norse, all pointing to the idea of a visible indicator. The word 'landmark' preserves the original boundary-marker sense.
Full entry on Wiktionary ↗A soft covering worn on the foot inside a shoe.
Sock comes from an Old English word borrowed from Latin, referring to a light slipper or shoe. The Latin word may itself have come from Greek. Over time the meaning narrowed from a light shoe to the knitted foot covering we know today.
Full entry on Wiktionary ↗Definitions give each word’s most common meaning — the full entries live at Wiktionary.