to protect someone esle from the attention or criticism due for a particular activity; To help someone in the performance of a task, but not directly assisting in the task.

From American Football where certain players are detailed to prevent the opposing team from tackling the palyer with the ball, by interfering with them.

The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.

originating from football, to attract attention to yourself or throw yourself into harm's way to help out a friend.

To cause a commotion make a spectacle of one's self or to just generally draw attention to yourself in order to allow someone to do something.

To deflect attention away from someone else.

to provide justification, protection, etc.

When a person steals something from you and you chase after them in order to stop them.