pile on

verb

To jump on top of someone or something quickly.
“As football linebackers pile on a quarterback in a blitz, the newspaper editorialist heaped sarcasm onto the president.”
“Piling on: Players may not pile on a runner after the ball is dead or intentionally fall upon any prostrate player.”
To criticize someone or something in a concerted effort; to add on some additional critique.
“OK, OK, they've already gotten the constructive criticism. Now you're just piling on.”
“Piling on Nickelback is old hat. Can't we all just move on already? Chad Kroeger and his band are still the group everyone loves to hate, but after the Queensland police put out a wanted poster for them for ‘crimes against music’ Luke Holland asks: has the hating gone too far?”
To unnecessarily extend the margin of a winning score.
To add or apply in great quantities.