interlining

Short definition from Wiktionary

Noun

1. 1
   A cloth lining between the outer and inner layers of a garment.
2. 2
   Correction or alteration by writing between the lines; interlineation.
3. 3
   The scheduling of vehicles to operate more than one route, or the selling of tickets for a trip across multiple carriers

Verb

1. 1
   present participle and gerund of interline