Answer: fullspeedahead

AnswerCrossword Clue
FULLSPEEDAHEAD

"Go!"

FULLSPEEDAHEAD

Skipper's command

FULLSPEEDAHEAD

Exhortation to the engine room

FULLSPEEDAHEAD
Nautical command
FULLSPEEDAHEAD
Farragut's advice
FULLSPEEDAHEADCaptain's command