summer melt
n.— «Because of overcrowding problems in previous years, the college reduced the number of offers of admission from 3,486 in 2003 to 3,366 this year. However, this year the college’s admissions office experienced an unexpected low “summer melt” of just 26 students. The summer melt refers to the number of students who initially enroll at William and Mary after being admitted and later decide to attend a different college or university. In 2003, the summer melt was 57 students. Two years ago, it was 43 students.» —“W&M makes space for crowded Class of 2008″ by Brian Whitson William & Mary News (Williamsburg, Virginia) Aug. 17, 2004. (source: Double-Tongued Dictionary)