To overload or overtax.
A sterile stratum that lies above the stratum being investigated
The rock and subsoil that lies above a mineral deposit such as a coal seam.
To harass; to irritate or distress.
To touch repeatedly, to fiddle with.
To be troubled; to give way to mental anxiety or doubt.
To seize or shake by the throat, especially of a dog or wolf.
Disturb the peace of mind of; afflict with mental agitation or distress.
A strong feeling of anxiety.
An instance or cause of such a feeling.
A person who causes worry.