the mother of all something

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

所有...之最, 最大的, 最難的

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.
期末考試是所有考試中最難的
They faced the mother of all traffic jams on their way to the concert.
他們在去音樂會的路上遇到了史上最大的交通堵塞。