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Wiktionary
color in

alt. To add colors to a black-and-white drawing, using colored drawing equipment. vb. To add colors to a black-and-white drawing, using colored drawing equipment.

WordNet
color in

v. add color to; "The child colored the drawings"; "Fall colored the trees"; "colorize black and white film" [syn: color, colorize, colorise, colourise, colourize, colour, colour in] [ant: discolor]

Usage examples of "color in".

Its branches melted together, the color in the leaves seeming to spread and blur as they became cactus arms.