What's the meaning of "getting blood from a stone"!?
We use it when someone gives or tells us something extremely difficult because of the character or mood of the person we are dealing with.
For example:
Getting an apology out of my friend is like getting blood from a stone!
زمانی بکار میره که شخص موردنظر برای دادن یا گفتن چیزی "سختش" باشه. مثل گرفتن خون از سنگ میمونه