Answer:

swarmed

Answer	Crossword Clue
SWARMED	Moved en masse
SWARMED	Moved as a multitude
SWARMED	Overran

SWARMED	Moved like bees
SWARMED	Emulated honeybees
SWARMED	Traveled en masse
SWARMED	Flew together, as bees
SWARMED	Thronged.
SWARMED	Congregated
SWARMED	Was overrun
SWARMED	Moved like army ants

SWARMED	Teemed
SWARMED	Like rock stars among fans

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.