effriter

/efʁite/
1.
verbInf1stPres

to crumble; to break into small pieces (physically)

Le vieux mur commence à s'effriter avec le temps.

The old wall is starting to crumble over time.

2.
verbInf1stPres

to erode or wear away gradually; to dwindle (support, authority, popularity)

Après le scandale, sa popularité a commencé à s'effriter.

After the scandal, his popularity began to erode.