Found 2 items, similar to undergird.
English → English (WordNet) Definition: undergird undergird v 1: lend moral support to 2: make secure underneath; “undergird the ship” [syn: brace up] [also: undergirt]
English → English (gcide) Definition: Undergird Undergird \Un`der*gird"\, v. t. To blind below; to gird round the bottom. [1913 Webster] They used helps, undergirding the ship. --Acts xxvii. 17. [1913 Webster]