IPA: /ˈɔːrzˌmænʃɪp/
KK: /ˈɔrzˌmænʃɪp/
The ability or skill to row a boat using oars.
His oarsmanship was evident as he expertly navigated the river.
Oarsmanship is formed from "oar" (from Old English "ār", meaning a tool for rowing) and "-smanship" (from Old English "scipe", meaning the art or skill of). The word refers to the skill or art of using oars for rowing.
Think of the 'tool for rowing' ('oar') and the 'skill' ('-smanship') needed to use it effectively — that's what oarsmanship means.