Word
Quid pro quo
Something given or granted in exchange for something else: a favor with a return expected
Examples
The endorsement was a quid pro quo: support the bill now, get the committee seat later.
Their friendship curdled into quid pro quo: every dinner invitation arrived with an ask attached.
Origin
Latin, “something for something.” In sixteenth-century English it was an apothecaries' term for substituting one medicine for another; within a century the swapped remedies had become swapped favors, and the pharmacy sense died out.
How it connects
The phrase names the honest version of the exchange everyone is already in.
This word appeared in Nothing for nothing, the Involves connection for August 14, 2026, which asked: Why does every favor create a debt?
Check yourself
Which exchange is a quid pro quo?
A senator's vote traded for a promised judgeship.. Right. Something specific is given for something specific in return. That mutual expectation is the definition.
What the sources establish
Quid pro quo entered English in the sixteenth century as a term for substituting one medicine for another before shifting to its modern sense of exchanged favors.
Sources
Quid pro quo (Merriam-Webster), History and etymology; the apothecaries' substitution sense