Possible Clues:

• Move in large numbers, having suitable backing
• Beat down group by the sound of it
• Heard 11 or 15, say, are full
• Come down hard, but fit to go back
• Pour and then some
• The way to meet up with so many of them
• We hear the side is to come down heavily
• Rain in buckets
• Be prolific, satisfied about income ultimately brought in
• Burst