What ho!

Hello!

This phrase appears in PG Wodehous's My Man Jeeves,
when someone appears at the door.
What does it mean?
What is the origin?

Thank you
Judy
(Israel)

What ho! was an informal greeting commonly used by Bertie Wooster, equivalent to Hi there!
Without is the opposite of within. Without there means outside the door.

Ho\, Hoa \Hoa\ Halloo! attend! -- a call to excite attention or to give notice of approach. "What noise there, ho?"--Shak. "Ho! who's within?"--Shak.

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