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тотчас adv. stresses
gen.	anon; right away; forthwith; instantly; now; therewith; directly; therewithal; offhand; immediately; on the instant; quick off the mark; right then (if in the past tense djnickhodgkins); right there and then (if in the past; wordy djnickhodgkins); straightway; this moment; at a moment's notice (The Duchess is ... staying at Kensington Palace .... The Duke of Cambridge is in Wales, but has borrowed a helicopter which is parked on the lawn of his rented cottage so he can fly to London at a moment's notice. 4uzhoj); straight away (immediately • Do it straight away); in graith; downright; eft; fast beside; fast by; out of hand; on the upon the instant; off hand; outright; plump; plumpy; presently; readily; upon the spot; straight; strait; thereupon; in no time; at no time; strait waistcoat; at the drop of a hat
Gruzovik	on the spot
amer.	on a dime (Eranwen)
fr.	tout de suite (Баян)
inf.	in a heartbeat (I'd do it again in a heartbeat. Val_Ships)
lat.	instanter
Makarov.	incontinently; in an instant
math.	at once
med.	statim
obs.	incontinent; foot hot; straightforth; straightways; streight
poetic	brief
relig.	by and by
slang	bang off

тотчас : 104 phrases in 7 subjects

American usage, not spelling	1
Business	1
General	76
Idiomatic	1
Informal	2
Makarov	21
Obsolete / dated	2