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की गलती थी

was …'s fault

→ की
phrase Rare #7,954
was …'s fault The person's name or pronoun comes before “की”; “की” links them to “गलती” (fault), and “थी” means “was.”
HI: यह मेरी गलती थी।
EN: This was my fault.

टॉम की गलती थी।

It was Tom's fault.

तुमने जो किया उसमें क्या स्कूल की गलती थी?

Was the school at fault for what you did?

— OMG 2 (2023)

यह बेबी की गलती थी।

It was Baby's mistake.

— The Boss Baby (2017)

ये कूमिको की गलती थी।

It was Kumiko's fault.

— 崖の上のポニョ (2008)