Underestimate vs. Undermine — What's the Difference?

To make too low an estimate of the quantity, degree, or worth of

To weaken by wearing away a base or foundation

To consider (someone) to be less capable or effective than is actually the case

To weaken, injure, or impair, often by degrees or imperceptibly; sap

An estimate that is or proves to be too low.

To dig a mine or tunnel beneath.

(transitive) To perceive (someone or something) as having a lower value, quantity, worth, etc., than what he/she/it actually has.

To dig underneath (something), to make a passage for destructive or military purposes; to sap.

An estimate that is too low.

(figuratively) To weaken or work against; to hinder, sabotage.

To set too low a value on; to estimate below the truth.

To erode the base or foundation of something, e.g. by the action of water.

The act of underestimating; too low an estimate.

To excavate the earth beneath, or the part of, especially for the purpose of causing to fall or be overthrown; to form a mine under; to sap; as, to undermine a wall.

An estimation that is too low; an estimate that is less than the true or actual value

Fig.: To remove the foundation or support of by clandestine means; to ruin in an underhand way; as, to undermine reputation; to undermine the constitution of the state.

Assign too low a value to;

Destroy property or hinder normal operations;

Make a deliberately low estimate;

Hollow out as if making a cave or opening;

Make too low an estimate of;