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Tap any rung for its meaning.
Two stepping stones: the L (rung 1, for shale) and the T (rung 3, for stall) — each borrowed to keep a rung a real word, then given back before the end. There may be several par routes — the census above shows which ones climbers actually took.
To move something rapidly back and forth.
From Old English 'scacan', meaning to move quickly or to flee. It is a very old Germanic word with relatives in several Scandinavian languages. The core sense of rapid movement has remained stable throughout its history.
Full entry on Wiktionary ↗To move in a spinning, circular pattern.
Probably of Low German or Dutch origin, related to words meaning to whirl or eddy. It appeared in English to describe spinning water or wind. Its exact origin is not fully certain.
Full entry on Wiktionary ↗Definitions give each word’s most common meaning — the full entries live at Wiktionary.