Undergird

Origin

From - + gird.

Full definition of undergird

Verb

1. To strengthen, secure, or reinforce by passing a rope, cable, or chain around the underside of an object.
2. To give fundamental support; provide with a sound or secure basis; provide supportive evidence for.
3. To lend moral support to.
4. To secure below or underneath.

Synonyms

• shore up
• fortify
• succour

Antonyms

• undermine