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1955, in the meaning defined above
French tachisme, from tache stain, spot, blob, from Old French teche, tache, of Germanic origin; akin to Old Saxon tēkan sign, Old High German zeihhan — more at token entry 1
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“Tachism.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tachism. Accessed 22 Sep. 2020.
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