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| knowledgeable (Sergei Aprelikov) | |||
| clued-up (Artjaazz) | |||
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| be with it (Anglophile); understand (Anglophile) | |||
| be no fool | |||
| rack one's brains (Val_Ships) | |||
| ponder; think; know the ropes | |||
| bend the brain (ART Vancouver); know the ropes; have enough space between the ears (VLZ_58); know the score (VLZ_58); figure out (mahavishnu); catch on (to mahavishnu) | |||
| savvy (MichaelBurov); savvey (MichaelBurov) | |||
| know (разбираться в чём-либо Abysslooker) | |||
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| savvy? | |||
