What is ⌥ Option + ⌘ Cmd + ↓ keyboard shortcut for?

Popular programs using this shortcut

What this shortcut does in different programs?

1. DaVinci Resolve 15 (Mac) - Move audio track destination down  
2. IntelliJ IDEA (macOS) - Shrink selection  
3. Xcode - Next Page  
4. Final Cut Pro X - Overwrite at the skimmer or playhead position in the primary storyline  
5. Airmail - Show/Hide Accounts  

All programs

All programs using this shortcut, by category.

Text editing

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Imaging

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Developer tools

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Media player

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Social & Messaging

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Productivity

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Note: This page includes variations for Option + Command + Down
Command + Option + Down
Option + Command + Down. Restrict to only Option + Command + Down.