Hello Pb03, If they arrived at lunchtime, they must have been going some . There is a grammar problem with the sentence in pink. First correct it please.
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LRR said:Interesting, I'd've bet it means
They must have been going some is a colloquial expression meaning they must have travelled very quickly.
CalifJimIt's not an idiom I've heard in American English."Going some" and "caning it" are two really common idioms in Britain that mean driving too fast.