by chance
US /baɪ tʃæns/
UK /baɪ tʃæns/

1.
secara kebetulan, tidak sengaja
without planning or intention; accidentally
:
•
I met my old friend by chance at the airport.
Saya bertemu teman lama saya secara kebetulan di bandara.
•
Did you find that book by chance or were you looking for it?
Apakah kamu menemukan buku itu secara kebetulan atau kamu mencarinya?