Mac OS Dock disappears… what to do?

Periodically, the dock at the bottom of my MacOS screen just… vanishes.
Unclear what causes this.

All the windows still work, but without the dock navigating between windows is a hassle.

Previously I had resorted to a reboot to correct this.
Just found this tip.

In short:

  1. In a terminal window:
    killall Dock
  2. Command-Option-D

The dock is back.

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