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pile on the pounds
To put on weight quickly, especially a large or excessive amount. Wow, Jim really piled on the pounds on while he was on his sabbatical. I'm trying to pile on the pounds so I can make it on the football team this fall!
pile Pelion on Ossa
1. To further complicate something that is already tedious or challenging. Ossa and Pelion are two mountains in Greece. A: "I told Becky you would pick her up." B: "I already have so much to do today—quit piling Pelion on Ossa!" Just when I thought I was almost done sorting these files, my boss piled Pelion on Ossa and brought me another box of them.
2. To do something that seems futile. I know that I'm just piling Pelion on Ossa by telling you to stay away from that boy, but I'm your father, and I don't want to see you get hurt. That couch will never fit up the steps—tell them to stop piling Pelion on Ossa!
pile it on
To add a large and unnecessary amount of something. I like what you've written so far, but you should try being a bit more subtle with the dramatic tensions between the characters—it just feels like you're piling it on a bit. Poor Samantha. Her mother died of last winter, her husband lost his job recently, and now she's been diagnosed with breast cancer. Fate has just been piling it on.
pile (or heap) Pelion on Ossaadd an extra difficulty or task to an already difficult situation or undertaking. literary
In Greek mythology, the mountain Pelion was held to be the home of the centaurs, and the giants were said to have piled Mounts Olympus and Ossa on its summit in their attempt to reach the heavens and destroy the gods.