The definition of sibilance is when something has an s or sh sound. An example of sibilance is the hissing of a snake.
A wrench (or spanner outside of North America) is a tool used to provide grip and mechanical advantage in applying torque to turn objectsâusually rotary fasteners, such as nuts and boltsâor keep them from turning. In Commonwealth English (excluding Canada), spanner is the standard term.
A spanner or wrench is used for turning a nut, bolt or similar fixing that is turned to tighten. The spanner is used to grip the given fixing (whether it is a nut, bolt, concrete screw etc....) and turn it, allowing you to apply torque and tighten the nut onto the bolt.