pivot on/around

:  a shaft or pin on which something turns

:  a person, thing, or factor having a major or central role, function, or effect

:  a key player or position

:  turning on or as if on a pivot

:  pivotal

:  to turn on or as if on a pivot

:  to provide with, mount on, or attach by a pivot

:  to cause to pivot

:  in a circle or in circumference

:  in, along, or through a circuit

:  on all or various sides :  in every or any direction

:  on all sides of

:  so as to encircle or enclose

:  so as to avoid or get past :  on or to another side of

:  about

:  being in existence, evidence, or circulation