Schedule crashing is a technique used in project management to shorten the schedule duration for the least incremental cost by adding resources. It is a method used to shorten the project schedule without changing the project scope. When a project is behind schedule, project managers can opt for schedule crashing by allocating additional resources to critical path tasks. This approach can help to get the project back on track, but it often comes with increased costs, as resources are expensive12. References:
https://www.usemotion.com/blog/project-management-crashing
https://blog.masterofproject.com/schedule-compression-techniques/