unsplit

adj, verb — 2 senses

adj

Etymology From un- + split.

Not split; whole, undivided.

verb

Etymology From un- + split.

To undo the splitting of.

Like it or not, we are in a motor age and we can no more turn back the clock than we can unsplit the atom.1963, New Mexico Transporter:
To unsplit the split, click on the View Menu buttons and choose Unsplit Left/Right (v6.2) or Unsplit Main (v6.3).2012, Lee Lanier, Digital Compositing with Nuke:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.