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быть в ударе stresses
gen.	be on one's day; effervesce; be in royal spirits; be on song (When I was on song, I knew opponents couldn't stop me authorizator); give of one's best (User); give the best of oneself (User); beat one's best; be at one's best; be in a groove (bigmaxus); be on fire (Teana); hot streak (driven); be on fire (SirReal); be in form; be in good form; be in high snuff; be in royal spirits; be on one's game; be upon the pin
fig.of.sp.	in zone (I was in the zone and barely missed a shot all night. collinsdictionary.com Anastasia_GR)
footb.	be in rich vein of form (fluggegecheimen)
Gruzovik, inf.	be in a good mood
idiom.	be in the groove (You are in the groove tonight! nebelweiss)
inf.	cook with gas (Bartek2001); be in a good mood; roll (VLZ_58); nail it (в контексте какого-либо процесса ("I'm nailing it") trotteville)
Makarov.	be in high snuff; be at one's best; be in great form; be on one's day; be on the day; be in good form
Makarov., jarg., sport.	be on the money
poetic	be in capital form (icterubal)
sport.	be on the money (That day he was really on the money – В тот день он был действительно в ударе. Евгений Шамлиди); be on (he hasn't really been on in the last couple of games SirReal); on a tear (VLZ_58); on a hot streak (The team has recently been on a hot streak. [=the team has been winning a lot of games recently] VLZ_58); be on the money (That day he was really on the money – В тот день он был действительно в ударе. Евгений Шамлиди)

быть в ударе: 19 phrases in 5 subjects

American usage, not spelling	1
General	7
Makarov	8
Slang	2
Sports	1