unpin one’s back hair v.
(orig. US) to relax one’s inhibitions.
![[UK]](/static/img/flags/uk.png "United Kingdom") | DSUE (8th edn) 677/1: [...] since ca. 1925, but not very common in UK before ca. 1950. |
(orig. US) to relax one’s inhibitions.
| DSUE (8th edn) 677/1: [...] since ca. 1925, but not very common in UK before ca. 1950. |