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1. Literally, to cut or slice something into smaller pieces. A noun or pronoun can be used between "chop" and "up." Can you chop up the onions for the stew? Chop up the lumber so we can use it for firewood.
2. By extension, to split something into smaller sections. A noun or pronoun can be used between "chop" and "up." This paragraph was way too long, so I chopped it up.
1. To cut something into small pieces with a sharp tool: The cook chopped up the parsley. I chopped an onion up and added it to the soup.
2. To divide something into smaller segments: The editor chopped the manuscript up into distinct chapters. I chopped up the long drive by making frequent stops.