honeymoon period

Noun

• A relatively brief period when a new leader is given greater leeway with respect to changes he or she wishes to make.
• A relatively brief period when a new loan has a low introductory interest rate that features prominently in advertising.
• The length of time at the start of something new, particularly a new job, in which mistakes may be overlooked.
• The early part of an intimate relationship, in which the couple are infatuated with each other.