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English word undermine comes from English mine, English under-
mine (English)
(ambitransitive) To remove (ore) from the ground.. (computing) To earn new units of cryptocurrency by doing certain calculations.. (intransitive) To dig a tunnel or hole; to burrow in the earth.. (slang) To pick one's nose.. (transitive) To damage (a vehicle or ship) with a mine (an explosive device).. (transitive) To sow mines (the explosive devices) in (an area).. To dig away, or otherwise [...]
under- (English)
Under (in any sense): insufficient, insufficiently, below what is correct; subordinate to; beneath or behind.
undermine (English)
(figuratively) To weaken or work against; to hinder, sabotage. [from 15th c.]. To dig underneath (something), to make a passage for destructive or military purposes; to sap. [from 14th c.].