To dry up is to lose all moisture, or to run out of things to say. The stream dried up.
The two senses share the idea of a supply ending. To dry up on stage is the actor's word for forgetting a line entirely.
1phrasedry upTo lose all moisture, or to run out of things to say.
“The conversation would dry up the moment he sat down.”
dry up is a phrase.
Practised in Phrasal Verbs