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

Popular programs using this shortcut

What this shortcut does in different programs?

1. Xcode - Next Page
2. IntelliJ IDEA (macOS) - Shrink selection
3. DaVinci Resolve 15 (Mac) - Move audio track destination down
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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Ace Editor (Mac) - Copy lines down

Imaging

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DaVinci Resolve 15 (Mac) - Move audio track destination down

Final Cut Pro X - Overwrite at the skimmer or playhead position in the primary storyline

Sketch - Send backward

Xcode - Next Page

Developer tools

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IntelliJ IDEA (macOS) - Shrink selection

Media player

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iTunes 11 for Mac - Mute the sound (song keeps playing)

Social & Messaging

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Cisco Jabber (Mac) - Mute / unmute your voice

Productivity

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Airmail - Show/Hide Accounts

Things (iPad) - Move selection to bottom of list

Things (Mac) - Move selection to bottom of list

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