• erode the base or foundation of (a rock formation)

Synonyms: erode, wear away, eat away at, chip away, undercut

• lessen the effectiveness, power, or ability of, especially gradually or insidiously

Synonyms: subvert, sabotage, threaten, weaken, compromise, diminish, reduce, impair, mar, spoil, ruin, impede, hinder, damage, hurt, injure, cripple, disable, enfeeble, sap, shake