What is Backstopping?

Backstopping definition and meaning on Dictionary terms:
a wall, wire screen, or the like, serving to prevent a ball from going too far beyond the normal playing area.
Baseball. the catcher.
a person or thing that serves as a support, safeguard, or reinforcement: There were technicians on board as backstops to the automated controls.

verb (used without object), backA.stopped,
to act as a backstop.

verb (used with object), backA.stopped,
to act as a backstop to: The government agreed to backstop companies that invested in oil exploration.