The story
- Proto-Italic*wre-
- Latinre-
- Old Frenchre-
- Proto-Indo-European*(s)leg-
- Proto-Indo-European*(s)leg-s-ós
- Latinlaxus
- Latinlaxō
- Vulgar Latin*laxicāre
- Vulgar Latin*lassicāre
- Old Frenchlaschier
- Old Frenchrelaschier
- Old Frenchrelaisser
- Middle Englishrelesen
- Englishrelease
- English today-relin
From rel(easing) + -in.
Etymology from Wiktionary, CC BY-SA 4.0.