Prest money

from The Collaborative International Dictionary of English v.0.48

Prest \Prest\, a. [OF. prest, F. pr[^e]t, fr. L. praestus ready.
   Cf. {Presto}.]
   1. Ready; prompt; prepared. [Obs.]
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            All prest to such battle he was.      --R. of
                                                  Gloucester.
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   2. Neat; tidy; proper. [Obs.] --Tusser.
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   {Prest money}, money formerly paid to men when they enlisted
      into the British service; -- so called because it bound
      those that received it to be ready for service when called
      upon.
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