Undergird vs. Underpin

Undergirdverb

To strengthen, secure, or reinforce by passing a rope, cable, or chain around the underside of an object.

Undergirdverb

To give fundamental support; provide with a sound or secure basis; provide supportive evidence for.

Undergirdverb

To lend moral support to.

Undergirdverb

To secure below or underneath.

Undergirdverb

To bind below; to gird round the bottom.

Undergirdverb

lend moral support to

Undergirdverb

make secure underneath;

Undergirdverb

secure or fasten from the underside, especially by a rope or chain passed underneath.

Undergirdverb

provide support or a firm basis for

Underpinverb

(transitive) To support from below with props or masonry.

Underpinverb

To give support to; to corroborate.

Underpinverb

To lay stones, masonry, etc., under, as the sills of a building, on which it is to rest.

Underpinverb

To support by some solid foundation; to place something underneath for support.

Underpinverb

support from beneath

Underpinverb

support with evidence or authority or make more certain or confirm;

Underpinverb

support (a building or other structure) from below by laying a solid foundation below ground level or by substituting stronger for weaker materials.

Underpinverb

support, justify, or form the basis for