Last August, some headteachers blamed unexpected dips in results on Ofqual's moving of grade boundaries, a practice that is particularly likely when subjects have an influx of new entrants. (schoolsweek.co.uk)
Pool toys laying on the deck can easily become a tripping hazard, and a skinned knee or unexpected dip in the pool isn't anyone's idea of a good time. (momlifetv.com)
Particularly useful, she says, is being able to get up - to - the - minute account totals in the evening, when coffee prices on international commodities markets can take a sudden, unexpected dip. (inc.com)