IPA: /ˈɔːrlɒk/
KK: /ˈɔrˌlɑk/
A device that holds an oar in place, typically shaped like a U and attached to a boat, allowing for rowing.
The rower adjusted the oarlock to secure the oar while paddling.
Oarlock is formed from "oar" (from Old English "ār", meaning a tool for rowing) and "lock" (from Old English "locc", meaning a fastening or a device that secures). The word "oarlock" refers to a device that secures an oar in place while rowing.
Think of an 'oar' as a tool for rowing that is 'secured' by a 'lock' — that's how an oarlock keeps the oar in place.