Definition of jackknife fish in English:
jackknife fish
noun
A strikingly marked fish with a long upright dorsal fin, which lives among rocks and corals in the warm waters of the western Atlantic.
Equetus lanceolatus, family Sciaenidae
‘The jackknife fish is a particularly handsome species, which immediately catches the eye with its long tapering first dorsal fin.’- ‘The Jackknife fish will comb the sandy bottom looking for worms, crustaceans, and small fish if it is hungry. It may even eat the occasional fireworm.’
Pronunciation
jackknife fish
/ˈjakˌnīf fiSH/ /ˈdʒækˌnaɪf fɪʃ/Are You Learning English? Here Are Our Top English Tips