Etymology of the word "left" - Language is fascinating!!!

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"opposite of right," probably from Kentish and northern English forms of Old English *lyft "weak; foolish" (in lyft-adl "lameness, paralysis"). Compare East Frisian luf, Dutch dialectal loof "weak, worthless").

Sense of "opposite of right" is from the left being usually the weaker hand), a derived sense also found in cognate Middle Dutch and Low German luchter, luft. Compare Lithuanian kairys "left" and Lettish kreilis "left hand" both from a root that yields words for "twisted, crooked."

The usual Old English winstre/winestra "left" (adj.); "left hand," literally "friendlier," a euphemism used superstitiously to avoid invoking the unlucky forces connected with the left side (compare sinister). The Kentish word itself might have been originally a taboo replacement, if instead it represents PIE *laiwo- "considered conspicuous" (represented in Greek laios, Latin laevus, and Russian levyi). Greek also uses a euphemism for "left," aristeros "the better one" (compare also Avestan vairyastara- "to the left," from vairya- "desirable").

Meaning of Debit -

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The term debit is similar to the term used in Italy more than 500 years ago when the double entry accounting system was documented. What you need to know today is that debit means left or left side. For example, every accounting entry will have a debit entered on the left side of a general ledger account. (There will also need to be a credit amount entered on the right side of another account.) The abbreviation for debit is dr. (which is also related to the term from 500 years ago).

Credit literally means "right side"