1) Becloud 2) Benight 3) Blur 4) Cloud 5) Darken 6) Lower the lighting 7) Lower the lighting in 8) Lower the lights 9) Make hazy 10) Make indistinct 11) Make less bright 12) Make murky 13) Make obscure 14) Make obscure or unclear 15) Make shadowy 16) Muddle 17) Obfuscate 18) Obscure 19) Shroud 20) To make dim Found on https://www.crosswordclues.com/clue/bedim
Be·dim' transitive verb [ imperfect & past participle Bedimmed ; present participle & verbal noun Bedimming .] To make dim; to obscure or darken. Shak. Found on http://www.encyclo.co.uk/webster/B/29