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To produce something by knitting, often with little effort. A noun or pronoun can be used between "knit" and "up." Can you believe Grandma just knitted up this sweater for me? It would take me weeks to make something like this!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
To create something by knitting, especially quickly or easily: I knitted up some mittens for my grandchildren. I knitted some hats up for the church sale.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.