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поначалу adv. stresses
gen.	originally; at the start; early on (Notburga); at the beginning (bookworm); at first sight; at first view; in the early going (VLZ_58); at first (bookworm); out of the gate (maystay); for a start (Andrey Truhachev); tо begin with (Avrile); for the first little while (4uzhoj); primarily (MichaelBurov); erst (MichaelBurov); in the first instance (MichaelBurov); erenow (MichaelBurov); first (MichaelBurov); over again (MichaelBurov); first of all (MichaelBurov); start with (MichaelBurov); at the first outset (MichaelBurov); at the first go-off (MichaelBurov); before (MichaelBurov); initially (MichaelBurov); in the early (MichaelBurov); at first glance
Gruzovik, inf.	firstly; in the beginning
inf.	in the first little bit (ART Vancouver)
scient.	initially (igisheva)
slang	at first blush (Mirinare)

поначалу: 15 phrases in 4 subjects

General	4
Idiomatic	3
Makarov	7
Slang	1