interlining

plural interlinings

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

   a. 1716 (date written), [Gilbert] Burnet, edited by [Gilbert Burnet Jr.], Bishop Burnet’s History of His Own Time. […], volume (please specify |volume=I or II), London: […] Thomas Ward […], published 1724, →OCLC

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.

1. gerundparticiplepresentpresent participle and gerund of interline