British present participle of caucus, using the double-s spelling convention before adding -ing.
From caucus with the British consonant-doubling rule (caucuss-) before adding the present participle suffix -ing. This creates the British variant of the American 'caucusing.'
While American politicians are 'caucusing,' their British counterparts would be 'caucussing'—a tiny spelling difference that shows how two branches of English developed separate but parallel conventions for handling consonants.
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