He then declared a 6-thirty day period moratorium on new deepwater drilling permits and leases, pending regulatory evaluation. American Economic Review. 107 (9): 2565-2599. doi:10.1257/aer.20160812. In December 2009, the New Oxford American Dictionary declared its term of the 12 months to be the verb "unfriend", defined as "To eliminate another person as a 'friend' on a social networking site these kinds of as Facebook".