Final answer:
Sideways refers to a direction that is perpendicular to another reference direction. In physics, sideways stress or shearing force causes a deformation perpendicular to the original direction. Shear deformation is described using equations and is associated with shear modulus.
Step-by-step explanation:
Sideways refers to a direction that is perpendicular to another reference direction. In the context of physics, sideways stress or shearing force is a type of stress that causes a deformation perpendicular to the original direction. Shear deformation, similar to tension and compression, can be described using equations and is associated with a property called shear modulus.