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1. To make a quick, rough drawing of something, especially as a detail or element of a larger work. A noun can be used between "sketch" and "in." They asked me to sketch in a few people to make the painting of the park feel more real. She sketched some popular tourist locations in on my map.
2. To present or write smaller details or aspects of a larger thing. A noun or pronoun can be used between "sketch" and "in." We really liked your proposal, but we were hoping you could sketch in a few more specifics before we sign off on it.
sketch something in
to draw in the image of someone or something. I sketched a figure of a woman in so that she appears to be standing beneath the tree. I'll sketch in the house in the upper left corner.
1. To add a hasty or undetailed drawing or painting of something to a larger work: The artist sketched in the leaves before painting. We finished sketching the margins in.
2. To give a general account or presentation of some aspect of a larger idea: The staff sketched in the details of the proposal. We sat down and sketched the fine points in.