To pass on to higher authority for resolution. See also pass the buck.
To encourage; to hearten.
To become encouraged, reinvigorated, or cheerful; to summon one's courage or spirits; to pluck up courage.
Cheer up; take courage; take heart.
To weaken or work against; to hinder, sabotage.
To erode the base or foundation of something, e.g. by the action of water.
To dig underneath (something), to make a passage for destructive or military purposes; to sap.