any external prop or support built to steady a structure by opposing its outward thrusts, esp. a projecting support built into or against the outside of a masonry wall.

any prop or support.

a thing shaped like a buttress, as a tree trunk with a widening base.

a bony or horny protuberance, esp. on a horse's hoof.

to support by a buttress; prop up.

to give encouragement or support to (a person, plan, etc.).

verb

let down , weaken

noun

abutment , column , mainstay , pier , prop , reinforcement , shore , stanchion , stay , strut , underpinning , brace , crutch

verb

back up , beef up * , brace , build up , bulwark , carry , jack up , jazz up , prop , reinforce , shore , step up , strengthen , sustain , uphold , corroborate , substantiate , abutment , bolster , boost , pad , pier , pile , stay , strut , support