knock spots off sth

knock spots off sth {UK, infml} (to be overwhelmingly better than sth or sb else; beat or surpass easily) — утереть нос кому-л.; заткнуть кого-л. за пояс; превзойти намного; дать сто очков вперед; перещеголять; переплюнуть

Example 1: There's a vegetarian restaurant in Brighton that knocks spots off any round here. (СALD)

Example 2: This ingenious colour viewfinder knocks spots off current LCD displays. (СALD)

Example 3: Well, all I can say is she knocks spots off anybody I’ve seen in London. (J.B.Priestly, “Wonder Hero”) — Знаешь, она всех, кого я видел в Лондоне, за пояс заткнет (=никто не может с ней сравниться)

Example 4: I never really know why we laughed at him; for sheer intellect he knocked spots off the rest of us. (P.H.Johnson, “An Impossible Marriage”) — До сих пор не знаю, почему мы смеялись над ним: по своему развитию он мог всех нас за пояс заткнуть (=он был умнее всех нас)

see also
[can't hold a candle to sb]
[good run for one's money] 2
[not a patch on sb]
[streets ahead of sb]
[head and shoulders above sth]
[run circles around sb]
not qualified to tie one's shoes
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Origin
Perhaps from the use of playing cards as targets at shooting galleries, the spots being the pips one is required to hit.