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as for the blood|stone|water image:
to "get blood from a stone" means to do the impossible.
"like getting blood from a stone" some one really doubts the possibility of some thing happening they might say "that would be like getting blood from a stone" as in impossible-very difficult.
as for the blood|stone|water image:
to "get blood from a stone" means to do the impossible.
"like getting blood from a stone" some one really doubts the possibility of some thing happening they might say "that would be like getting blood from a stone" as in impossible-very difficult.