Definitions for "Foot fault"
Keywords:  baseline, fault, illegal, serve, racket
An illegal position of the server's feet during the serve.
A fault on which the server's foot touches outside the service area.
Illegal placement of a foot or feet outside of the service zone in execution of the serve.
Stepping or touching beyond the throw line while delivering a dart
When a thrower fails to keep both feet within the nominated throwing area until they have released their boomerang. The feet should be entirely behind the line (or within the circle).
Keywords:  disengage, cleats, pedals, can't, rider
when a rider can't disengage his cleats from the pedals before falling over. See horizontal track stand.