Editing : Editing Clips and Selections : Creating New Clips : Clip Overlap and Underlap

Clip Overlap and Underlap
When a tick-based audio track has multiple clips, an increase in tempo can cause neighboring clips to overlap. Audio clips can be set to display a small “dog-ear” corner to indicate overlapping clip boundaries.
To toggle the display of overlap and underlap clip boundaries:
*
Choose View > Clip > Overlap.
Changing Clip Overlap/Underlap
After tempo changes with tick-based audio, and other edits, clips may overlap in undesired ways. To correct this, a clip can be brought to the front, or sent behind neighboring clips as needed.
To change the clip overlap or underlap:
1 In the Edit window, choose the clip or clips you want to re-order.
2 Do one of the following:
*   
Choose Clip > Bring to Front to make the clip overlap the neighboring clips.
– or – 
*   
Choose Clip > Send to Back to make the clip underlap the neighboring clips.
If multiple overlapping clips are selected, Pro Tools will apply the command to each clip as that clip relates to the neighboring clip on the right.