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у него семь пятниц на неделе stresses
gen.	he is off again, on again about it; he doesn't know his own mind (Anglophile); he keeps blowing hot and cold (Anglophile)
inf.	he keeps changing his mind; he is just like the weather
Makarov.	he does one thing one day and another the next; he says one thing one day and another the next
proverb	he keeps blowing hot and cold