I believe the back-scratching metaphor describes a QUID pro quo situation...
Meaning and definitions of quid, translation in Luxembourgish language for quid with similar and opposite words. Also find spoken pronunciation of quid in Luxembourgish and in English language.
What quid means in Luxembourgish, quid meaning in Luxembourgish, quid definition, examples and pronunciation of quid in Luxembourgish language.