Answer:

undam

Answer	Crossword Clue
UNDAM	Allow to run, in a way
UNDAM	Allow to flow
UNDAM	Stop stopping up

UNDAM	Unleash, as water.
UNDAM	Release pent-up waters.
UNDAM	Release, as river water.
UNDAM	Let loose
UNDAM	Let flow
UNDAM	Open, as floodgates
UNDAM	Stop blocking, as a river
UNDAM	Allow to flow freely again

UNDAM	Allow to flow again
UNDAM	Let flow again

Crossword

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