जाने क्यों दिया

why did [you] let … go?

→ जाना
phrase Uncommon #5,461
why did [you] let … go? The person who was allowed to go is implied or supplied by context. जाने देना means “to let someone go.”
HI: तुमने उसे घर जाने क्यों दिया?
EN: Why did you let him go home?