A simple valve with a hinge on one side; allows fluid to flow in only one direction.
1
It made a gratifying clackety-clack sound every time I took a step.
2
The lickity-clack of the wheels on the track gobbled up the minutes.
3
And with them new high heels on the sidewalk clack, clack, clack.
4
He heard teeth snapping open and closed, a horrific clack, clack, clack.
5
He slammed the door and Judy heard the bolt clack into place.