English

Verb

turn flukes

1. Of a whale: to go under, dive.
2. (nautical slang) To turn in, go to bed.
   • 1851, Herman Melville, Moby Dick, chapter 3

     But come, it's getting dreadful late, you had better be turning flukes--it's a nice bed; Sal and me slept in that ere bed the night we were spliced.