Answer:

meshing

Answer	Crossword Clue
MESHING	Working together
MESHING	Engaging, as gears.
MESHING	Engaging

MESHING	Synchronous
MESHING	Interdigitation, e.g.
MESHING	Fitting together

Crossword

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