DictionaryRoot: tronchon
Old French
tronchon
piece cut off, thick stick, stump
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noun
truncheon
TRUN-chun/ˈtrʌntʃən/
A short, heavy club used as a weapon, especially by police.
Etymology
Old French tronchon meant a cut-off piece or thick stick. That concrete sense carries into the weapon: a short, stout piece of wood used as a club.