*blakrōną

From Proto-Indo-European root *bʰel- (‘to blaze; glow; bright flame; white’). Equivalent to *blakōną (‘to burn, to blacken’) + *-r-+ *-ōną (frequentative suffix). The *-r-is a stem-enlarging consonant before weak class 2 *-ōną, typically making the verb more vivid, repeated, durative, or sound-symbolic in character. Compare *glitrōną (‘shine, glisten, glitter’), *hwīskrōną / *hwisprōną (‘whistle, hiss, whisper’), *stamrōną (‘stammer’), *klibrōną (‘climb, clamber; scratch, claw’). Possibly a cognate with Latin flagrō (‘I burn’), which originates from the same root, using a zero-grade form + *-ró-extension.