knock spots off somebody/something
knock (the) spots off (someone or something)
To completely outclass, outdo, or outperform someone or something; to soundly defeat or best someone or something. Primarily heard in UK, Australia. Wow, this coffee knocks the spots off the stuff we get back home. Catherine knocked spots off the other kids in the spelling bee.
knock spots offeasily outdo. informal
This expression may refer to shooting out the pips (spots) on a playing card in a pistol-shooting competition. Although it is now found chiefly in British English, the phrase originated in America.
1997 Spectator [ Walter Laut Palmer's ] ‘Morning in Venice’ is a tour-de-force…It knocks spots off the neighbouring, deeply unattractive, Monet of a gondola.