At fault

What is At fault?

At fault definition and meaning on Dictionary terms:

a defect or imperfection; flaw; failing: a fault in the brakes; a fault in one’s character.
responsibility for failure or a wrongful act: It is my fault that we have not finished.
an error or mistake: a fault in addition.
a misdeed or transgression: to confess one’s faults.
Sports. (in tennis, handball, etc.)

  1. a ball that when served does not land in the proper section of an opponent’s court.
  2. a failure to serve the ball according to the rules, as from within a certain area.
Geology, Mining. a break in the continuity of a body of rock or of a vein, with dislocation along the plane of the fracture (fault plane).