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Go to Applications ➔ Utilities ➔ Terminal.app [type] killall -9 Dock
Go to Applications ➔ Utilities ➔ Terminal.app
[type]
killall -9 Dock
Reference https://superuser.com/questions/7715/cmd-tab-suddenly-stopped-working-and-my-dock-is-unresponsive-what-do-i-do/7717#7717
