←
Old English wuna (cognate)
←
Old English sidu (cognate)
←
Old English cyre (cognate)
←
Middle English custume (inherited)
←
Middle English wune (cognate)
←
Middle English side (cognate)
←
Middle English cure (cognate)
←
Proto-Indo-European *dʰeh₁- (root)
←
Proto-Indo-European *ḱóm (derived)
←
Proto-Indo-European *swé (mention)
←
Proto-Indo-European *dʰeh₁- (mention)
←
Old Latin com (derived)
←
Proto-Italic *kom (derived)
→
Tok Pisin kastom (inherited)