verb/de.lɛs.te/
to unballast, to remove ballast from (a ship, balloon, etc.); to divert, to decongest (traffic, a road, etc.); to rid, to relieve (someone); to rob (someone); to get rid of, to cast off
“délester une route” — to divert traffic from a road, to reduce congestion on a road
From dé- + lester.