Answer: fullspeedahead

AnswerCrossword Clue
FULLSPEEDAHEAD"Go!"
FULLSPEEDAHEADSkipper's command
FULLSPEEDAHEADExhortation to the engine room
FULLSPEEDAHEADNautical command
FULLSPEEDAHEADFarragut's advice
FULLSPEEDAHEADCaptain's command