Reverse clip direction

`Command` + `R`

All hotkeys for iMovie (MacOS)

Information shortcuts Open help menu	`Shift` + `Command` + `?`
Information shortcuts Movie properties	`Command` + `J`
Import and Export shortcuts Import media	`Command` + `I`
Import and Export shortcuts Share the selection movie	`Command` + `E`
Play video Play video beginning from the frame beneath	`Spacebar`
Play video Play the selection	`/`
Play video Play the selected clip from beginning	`\`
Play video Play selected item in full screen	`Shift` + `Command` + `F`
Play video Exit full screen	`Esc`
Play video Move the palyhead by one frame	`Left arrow` / `Right arrow`
Manage events and projects Create a new movie project	`Command` + `N`
Manage events and projects Move to trash	`Command` + `Delete`
Manage events and projects Open iMovie preferences	`Command` + `,(comma)`
Audio related Open voiceover controls in the viewer	`V`
Audio related Turn on or silence audio while skimming video	`Shift` + `S`
Audio related Detach audio from a clip	`Option` + `Command` + `B`
Audio related Undo	`Command` + `Z`
Audio related Redo	`Shift` + `Command` + `Z`
Video edit Select an entire clip or project	`Command` + `A`
Video edit Deselect all clips	`Shift` + `Command` + `A`
Video edit Add the selection to the movie	`E`
Video edit Connect the clip at the playhead position	`Q`
Video edit Insert the selection in the movie	`W`
Video edit Automatically improve the Video and audio quality	`Shift` + `Command` + `E`
Video edit Cut the selected frames	`Command` + `X`
Video edit Copy the selected frames	`Command` + `C`
Video edit Paste	`Command` + `V`
Video edit Paste Color adjustment	`Option` + `Command` + `A`
Video edit Paste Crop adjustment	`Option` + `Command` + `R`
Video edit Paste stabilization adjustment	`Option` + `Command` + `Z`
Video edit Paste Rolling shutter adjustment	`Option` + `Command` + `T`
Video edit Paste volume adjustment	`Option` + `Command` + `O`
Video edit Paste the video effect	`Option` + `Command` + `L`
Video edit Paste the speed adjustments	`Option` + `Command` + `S`
Video edit Paste cutway Settings	`Option` + `Command` + `U`
Video edit Paste the map style	`Option` + `Command` + `M`
Video edit Rate favorite	`F`
Video edit Unmark selected frames	`U`
Video edit Rate the selection as rejected or delete	`Delete`
Video edit Loop Playback	`Command` + `L`
Video edit Open the clip trimmer	`Command` + `\`
Video edit Open the precision editor	`Command` + `/`
Video edit Crop	`Command` + `K`
Video edit Split clip at Playhead	`Command` + `T`
Video edit Create still frame	`Shift` + `Command` + `S`
Text edit Copy the selected Text	`Command` + `C`
Text edit Cut the selected Text	`Command` + `X`
Text edit Paste the copied Text	`Command` + `V`
iMovie window Minimize	`Command` + `M`
iMovie window Go to library view	`1`
iMovie window Go to iMovie theater	`2`
iMovie window Show or hide the Adjustment bar	`3`
iMovie window Show or hide the Libraries list	`Shift` + `Command` + `1`
iMovie window Show transitions in the browser	`Command` + `1`
iMovie window Show titles	`Command` + `2`
iMovie window Show map and backgrounds	`Command` + `3`
iMovie window Show your iTunes library	`Command` + `4`
iMovie window Show sound effect	`Command` + `5`
iMovie window Show your garageband library	`Command` + `6`
iMovie window Play in full screen	`Shift` + `Command` + `F`
View menu function Switch to Clip Viewer or Timeline Viewer	`Command` + `E`
View menu function Scroll to playhead	`Option` + `Command` + `P`
View menu function Scroll to selection	`Option` + `Command` + `S`
View menu function Zoom to selection	`Option` + `Command` + `Z`
Bookmarks Add bookmark	`Command` + `E`
Bookmarks Delete bookmark	`Shift` + `Command` + `E`
Bookmarks Next bookmark	`Command` + `]`
Bookmarks Previous bookmark	`Command` + `[`
Advanced Functions Paste over at playhead	`Shift` + `Command` + `V`
Advanced Functions Reverse clip direction	`Command` + `R`
Advanced Functions Lock audio clip at Playhead	`Command` + `L`
Navigation Play/Stop and Start/stop capture	`Space`
Navigation Move playhead to beginning of movie	`Home`
Navigation Forward one frame	`Right Arrow`
Navigation Forward ten frames	`Shift` + `Right Arrow`
Navigation Move playhead forward	`Hold Right Arrow`
Navigation Back one frame	`Left arrow`
Navigation Back ten frames	`Shift` + `Left Arrow`
Navigation Move playhead backward	`Hold Left Arrow`
Navigation Move between text filed	`Tab`
Navigation Jump forward to the next clip	`Down Arrow`
Navigation Jump to the beginning of the current clip or jump to the previous clip	`Up Arrow`
Accept/ Cancle Accept dialog (OK	`Return`
Accept/ Cancle Cancle dialog	`Esc`
Accept/ Cancle Cancle Dialog	`Command` + `Right arrow`