Nautical "Halt!" (5)
I believe the answer is:
avast
(Other definitions for avast that I've seen before include ""stop" signal" , "eleven [CEASE] at sea" , "Stop on board" , "Hold fast! (naut.)" , "shout stopping the ship" .)
I believe the answer is:
avast
(Other definitions for avast that I've seen before include ""stop" signal" , "eleven [CEASE] at sea" , "Stop on board" , "Hold fast! (naut.)" , "shout stopping the ship" .)