n.
1.(geology) the leaping movement of sand or soil particles as they are transported in a fluid medium over an uneven surface
2.a mutation that drastically changes the phenotype of an organism or species
3.an abrupt transition
4.taking a series of rhythmical steps (and movements) in time to music
5.a light springing movement upwards or forwards
Idiom of the Day
pull oneself up by one's bootstraps
to better oneself through one's own efforts
The boy pulled himself up by his bootstraps and decided to go back to university.