Polish flesz

← English flèche (link)

← English flash (borrowed)

← English camera flash (link)

← Middle English flasshen (derived)

← Middle English flasken (mention)

← Middle English flaskien (mention)

← French flèche (borrowed)

← Proto-Indo-European *plewk- (root)

← Polish fleszować (link)

← Polish fleszowy (link)