The story
- Proto-Indo-European*de
- Proto-Indo-European*déh₁
- Proto-Italic*dē
- Latindē
- Latindē-
- Proto-Indo-European*leykʷ-
- Proto-Indo-European*linékʷti
- Proto-Italic*linkʷō
- Latinlinquō
- Latindēlinquō
- Englishrelinquishinflu.
- English todaydelinquish
Borrowed from Latin dēlinquō (“to fail, err”) with the addition of -ish. Sense 1 was influenced by the similar verb relinquish.
Etymology from Wiktionary, CC BY-SA 4.0.