noun, masculine/tuʁ dy pɔ.to/plural: tours du poteau
the act of crossing an international border, generally for a very short period of time, in order to renew a visa or other government-issued permit before crossing back
“Je dois faire le tour du poteau d'ici mai afin de renouveler mon permis de travail.” — I need to cross the border between now and May in order to renew my work permit.
Literally, “circling of the flag pole”.