I feel they can convey different attitudes, but basically both mean agreeing to something.
Actually thinking about it, the reason is probably because both 'up' and 'down' don't actually have anything to do with what the phrases mean.
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"That's how it starts. Murder doesn't seem like a big deal, but then you end up lying, voting in elections... even selling your own books."
--Corso, in The Club Dumas by Arturo Perez-Reverte
Devious Comments
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Sugar Coated Razor Blades With Sex On Top
Actually thinking about it, the reason is probably because both 'up' and 'down' don't actually have anything to do with what the phrases mean.
--
"That's how it starts. Murder doesn't seem like a big deal, but then you end up lying, voting in elections... even selling your own books."
--Corso, in The Club Dumas by Arturo Perez-Reverte
"Yeah, I'm down for that."
--
Sugar Coated Razor Blades With Sex On Top
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