If you dry up when you are speaking, you stop in the middle of what you were saying, because you cannot think what to say next. If you ask her what she's good at she will dry up after two minutes
If a river, lake, or well dries up, it becomes empty of water, usually because of hot weather and a lack of rain. Reservoirs are drying up and farmers have begun to leave their land + dried-up dried-up a dried-up river bed. = dry
If a supply of something dries up, it stops. Investment could dry up and that could cause the economy to falter
If something dries up or if something dries it up, it loses all its moisture and becomes completely dry and shrivelled or hard. As the day goes on, the pollen dries up and becomes hard Warm breezes from the South dried up the streets. + dried-up dried-up a tuft or two of dried-up grass. = desiccated
dry up and shrivel due to complete loss of moisture; "a mummified body was found"