What is a plea bargin?

Noun:

an arrangement between prosecutor and defendant whereby the defendant pleads guilty to a lesser charge in exchange for a more lenient sentence or an agreement to drop other charges.

"the media coverage caused the judge to rethink the plea bargain"

verb:

make a plea bargain

The plea bargain is any agreement in a criminal case between the prosecutor and defendant whereby the defendant agrees to plead guilty or nolo contendere to a particular charge in return for some concession from the prosecutor.