cost
KAWST · verb
Origin
English cost comes from Middle English costen, from Old French coster/couster, from Medieval Latin cōstō, from Latin cōnstō, meaning 'stand together' — built from com- (together) and stō (stand).
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Journey
The Latin sense of things 'standing together' — a price and a good balanced against each other — narrowed in Medieval Latin and Old French into the specific idea of what something requires in payment, which passed directly into Middle English costen.
Related words
It shares its root stō ('stand') with the com- prefix seen in many 'together' words in Latin-derived English vocabulary.