Consider a cube-shaped object. to shear it, equal but oppositely directed forces might be applied:
to opposite faces, perpendicular to the faces
to adjacent faces, perpendicular to the faces
to a single face, in any direction (you don't need two only one is required for shear)
to opposite faces, parallel to the faces
to adjacent faces, as long as the force is not perpendicular or parallel to the faces

Rambling typically means to make incoherent speech, usually as a fact such as jumping topics at random points with no relations or similarities between the topics.

"The professor rambled on about his life experiences, but what has that got to do with our Algebra class? "

Another form of rambling is when it is used to describe a person wandering about. Usually, it can be used to describe when one goes on a walk or stroll with no direct purpose, or destination to get too.

"My father and I would go on a ramble in the western outback, but with no clear intentions. His eagle-eyes pierced the country-side, as if he was searching for the unknown; But what was the meaning behind his long-tirade walks and disoriented behaviors? "