Someone was soaked and says like this:
I think I need to rest and dry out.
According to the context, this means that he needs to rest and get his clothes and shoes to dry.
Here, is the “out” compulsory?
It's not compulsory in the sense that "dry" is a perfectly good intransitive verb, but I think that most people would naturally say "dry out" or "dry off" rather than just "dry". While things like paint and glue can dry, to me it seems faintly odd for a person to dry.
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It's not compulsory in the sense that "dry" is a perfectly good intransitive verb, but I think that most people would naturally say "dry out" or "dry off" rather than just "dry". While things like paint and glue can dry, to me it seems faintly odd for a person to dry.