- (transitive) to strengthen or reinforce by passing a rope, cable, or chain around the underside of (an object, load, etc)
WordReference Random House Unabridged Dictionary of American English © 2026
un•der•gird
(un′dər gûrd′),USA pronunciation v.t., -gird•ed or -girt, -gird•ing.
- to strengthen;
secure, as by passing a rope or chain under and around:to undergird a top-heavy load. - to give fundamental support;
provide with a sound or secure basis:ethics undergirded by faith.
- under- + gird 1520–30
Collins Concise English Dictionary © HarperCollins Publishers::
undergird /ˌʌndəˈɡɜːd/ vb ( -girds, -girding, -girded, -girt)