to change the national flag of or change the registered nationality of (a ship, aircraft, etc), for example for military protection, or to avoid certain rules
The concern also denied the plan to reflag the ship as Russian.
2.
to draw attention to (something) again
the Guardian's website still took the opportunity to reflag his 2001 article
reflag in American English
(riˈflæg)
verb transitiveWord forms: reˈflagged or reˈflagging
to register and sail (a ship) under a foreign nation's flag, as in order to extend to it military protection against a belligerent