Keywords: shark, dorsal fin
As a Noun
1. A very large fish with sharp teeth. It sometimes attacks people. English = shark.
2. A flat object that sticks out the back of some fish. It helps the fish swim and keep its balance. English = dorsal fin.
As a Verb or Adjective
1. (Of fish with dorsal fins) to travel through water close to the surface with the dorsal fin sticking out of the water.