Definition of line ahead in English:

line ahead

phrase

Nautical
  • A formation in which a number of ships follow one another in a line.

    • ‘In battle, the contending fleets sailed in line ahead, one ship following another, to bring the largest number of guns to bear on the enemy.’
    • ‘Squadron upon squadron rise to a great height, break into line ahead and there, the first machines hurtle perpendicularly down, followed by the second, third - ten, twelve aeroplanes are there.’