interlining

noun

1. A cloth lining between the outer and inner layers of a garment.
2. Correction or alteration by writing between the lines; interlineation.

   “And the interlinings seemed to be writ in a hand different from that in which the papers were writ”

3. The scheduling of vehicles to operate more than one route, or the selling of tickets for a trip across multiple carriers
4. The sharing of a segment of track between two rail lines.

verb

1. (form-of, gerund, participle, present)present participle and gerund of interline