solid
n. countablen. a helpful act or a favor you do for someone. You usually use this when you ask a friend for help with something small.
n. a favor or helpful act performed for another person. Informal in register; frequently used in the construction 'do someone a solid'.
Can you do me a solid and help me move this desk?
I decided to do him a solid and cover his shift so he could attend his sister's wedding.
While the request seemed minor, performing that small solid for the manager early in his career eventually paved the way for a significant promotion years later.
From Middle English solide, borrowed from Old French solide, from Latin solidus (“solid”), from Proto-Indo-European solh₂-i-dʰ-o-s (“entire”), suffixed form of root solh₂- (“integrate, whole”). Doublet of sol, sold, soldo, solidus, sou, and xu.
From Middle English solid, from the adjective, Middle French solide, or Latin solidum. Doublet of solidum.
Commonly used in the idiomatic phrase 'do (someone) a solid'.
He did a solid to meHe did me a solidThe expression 'do someone a solid' follows the double-object pattern; it does not typically use the 'to' prepositional phrase.