the mother of all something

US /ðə ˈmʌðər əv ɔːl ˈsʌmθɪŋ/
UK /ðə ˈmʌðər əv ɔːl ˈsʌmθɪŋ/
"the mother of all something" picture
1.

모든 것의 어머니, 최고의, 가장 큰

used to refer to an extreme example of something, often the largest, most impressive, or most difficult one

:
The final exam was the mother of all tests.
기말고사는 모든 시험의 어머니였다.
They faced the mother of all traffic jams on their way to the concert.
그들은 콘서트 가는 길에 모든 교통 체증의 어머니를 만났다.