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English word undertaker comes from English undertake
undertake (English)
(archaic, intransitive) To pledge; to assert, assure; to dare say.. (informal) To overtake on the wrong side.. (intransitive) To commit oneself (to an obligation, activity etc.).. (obsolete) To assume, as a character; to take on.. (obsolete) To engage with; to attack, take on in a fight.. (obsolete) To have knowledge of; to hear.. (obsolete) To have or take charge of.. (obsolete, transitive) [...]
undertaker (English)
(historical) A person receiving land in Ireland during the Elizabethan era, so named because they gave an undertaking to abide by several conditions regarding marriage, to be loyal to the crown, and to use English as their spoken language.. (rare) One who undertakes or commits to doing something.. A funeral director; someone whose business is to manage funerals, burials and cremations.