back-scratching
noun
back-scratch·ing ˈbak-ˌskra-chiŋ 
: the reciprocal exchange of favors, services, assistance, or praise
Word History
First Known Use
1882, in the meaning defined above
- Bloch wall
- block
- block (off)
- block and block
- block and tackle
- block ball
- block bond
- block book
- block booking
- block brake
- block capital
- block capitals
- block chords
- block coal
- block coefficient
- block copolymer
- block dance
- block diagram
- block dissection
- block down
- block faulting
- block figure
- block foot
- block grant
- block grants