merk-

“to become dark, to flicker and go out”

Debatedlight

murk, murky

Root of Old English mirce "murky, dark", Old Norse myrkr, yielding English murk, murky.

H₂eydʰ-“to burn, to kindle a fire”bʰeh₂-w-“to shine forth, to appear”bʰerǵ-eyo-“to keep brightening, shining”bʰewk-“to shine, gleam”bʰleg-“to shine, burn, flash”bʰleg-eyo-“to keep burning, blazing”bʰleg-mn̥-₂“blaze, shining fire”bʰleh₁-g-“to set on fire, to blaze”