English
interleave
From inter- + leave.
Proto-Indo-European *h₁én ‘in’
Proto-Indo-European *h₁entér ‘between’
Proto-Italic *n̥ter ‘between’
Latin inter ‘between’
English inter-
Proto-Indo-European *leyp- ‘to stick’
…
Proto-Germanic *laibijaną ‘to let stay’
Proto-West Germanic *laibijan ‘to leave behind’
Old English lǣfan ‘to leave’
Middle English leven ‘to leave’
English leave
Today it means
verb To insert (pages, which are normally blank) between the pages of a book.
Language periods are conventional ranges, not dates for this word.
Etymograph / interleave