blew / blue are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
blew: (verb) exhale hard. (verb) be blowing or storming. (verb) free of obstruction by blowing air through. (verb) make a sound as if blown. (verb) shape by blowing. (verb) spend lavishly or wastefully on. (verb) sound by having air expelled through a tube. (verb) play or sound a wind instrument. (verb) cause air to go in, on, or through. (verb) cause to move by means of an air current. (verb) spout moist air from the blowhole. (verb) lay eggs. (verb) cause to be revealed and jeopardized. (verb) allow to regain its breath. (verb) burst suddenly.
blue: (noun) blue color or pigment; resembling the color of the clear sky in the daytime. (noun) blue clothing. (noun) any organization or party whose uniforms or badges are blue. (noun) any of numerous small butterflies of the family Lycaenidae. (verb) turn blue. (adjective) of the color intermediate between green and violet; having a color similar to that of a clear unclouded sky; - Helen Hunt Jackson. (adjective) used to signify the Union forces in the American Civil War (who wore blue uniforms). (adjective) suggestive of sexual impropriety. (adjective) morally rigorous and strict. (adjective) causing dejection.
blew: b·l·UW
blue: b·l·UW
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)