Company policy forbids employees from privately exchanging gifts.
Tips
history
Cited in Qian Qianyi's late Ming essay on land-title abuse (钱谦益《牧斋初学集》): land granted by the emperor 'must not be privately transferred (私相授受)' between parties. The phrase has carried that whiff of illegitimate off-the-books handover ever since.
register
Formal, disapproving. Common in legal, journalistic, and compliance contexts when describing unauthorized transfers of property, authority, or influence.