A displacement is being pushed out of your seat, aircraft and/or domicile during a company down or resizing. Example, there are 100 EMB FOs each at DFW and ORD. Management decides to downsize DFW and upsize ORD to 90 and 110 respectively. A displacement bid is held where volunteers are given a shot then any remaining vacancies from from the bottom up meaning the most junior EMB FO is forced to ORD (or quits) and up the seniority list until the displacement is complete. Sometimes this involves retraining such as a LGA EMB FO going to SJU ATR FO or LGA EMB CA to ORD CRJ FO.