The word "downtoner" is spelled with three syllables: /daʊn.tə.nər/. It refers to something that diminishes or reduces the impact or strength of something else. The first part of the word, "down," is pronounced with the diphthong /daʊ/ as in "cow." The second syllable, "ton," is pronounced with a short /ə/ sound as in "son." The final syllable, "er," is pronounced with the schwa sound /ə/ as in "computer." The spelling of "downtoner" reflects its meaning of bringing something down or toning it down.
The word "downtoner" does not have a specific etymology as it is not widely recognized or established in the English language. It appears to be a combination of "down" and "toner", although the context and usage of the word are unclear. Without further information or context, it is difficult to determine its exact origin or meaning.