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задуматься v stresses
gen.	muse; take thought; sink into a reverie; put on considering cap (над чем-либо); pause to think (triumfov); fall into a muse (над чем-либо); have something on mind (о чём-либо Dyatlova Natalia); be away (погрузиться в свои мысли); think for; think to; conceive the idea; intend; reflect (над); think something over (над чем-либо Andrey Truhachev); wonder (MargeWebley); give it some thought (First Give It Some Thought. | Give it some thought. You think your day at school was bad? Remember, like 40 years ago it Alexander Demidov); think; ponder; put on thinking cap (над чем-либо); pause; have in mind; plan; be lost in thought (He sat for some time lost in thought. – задумавшись ART Vancouver); reflect (Mosley Leigh); contemplate (Mosley Leigh); meditate (over); hesitate
Gruzovik	become thoughtful (pf of задумываться); grow pensive (pf of задумываться); plunge into reverie (pf of задумываться); be deep in thought; brood (pf of задумываться; over)
inf.	be miles away (Andrey Truhachev)
Makarov.	fall to thinking; be deep in thought; become thoughtful; take the sun; be away
math.	think of
slang	use one's head
задумать v
gen.	frame a thought (что-л.); plan; decide on; decide to; think of; choose (e.g. a number in a game); bethink oneself; conceive; design; bethink; devise; compose (картину); lay a scheme; be up to (linton); contrive; resolve; come up with the idea of something (Tanya Gesse); have in mind; make up one's mind; come up with a plan (также come up with plans: An enthusiastic group of Peachlanders has come up with plans to carve a large Ogopogo sculpture and donate it to the municipality. (castanet.net) ART Vancouver)
Gruzovik	bethink oneself of (devise); plan; intend (pf of задумывать); contemplate (pf of задумывать); conceive the idea (pf of задумывать)
Игорь Миг	envision; mastermind; be out to
Makarov.	bethink to; have the intention
subl.	conceive of (It's the diversity, conflict and constant challenges of our young nation that prompted me to conceive of this book. ART Vancouver)
задумавшийся prtc.
gen.	thoughtful; preoccupied (Andrey Truhachev); absentminded (Andrey Truhachev); abstracted (Andrey Truhachev); distrait (Andrey Truhachev); absent-minded (Andrey Truhachev); in the clouds (coll. Andrey Truhachev); zoned out (разг. Andrey Truhachev); out of it (coll. Andrey Truhachev); spaced out (sl. Andrey Truhachev)
fig.of.sp.	wrapped up in thought (ART Vancouver)
задумайтесь v
gen.	consider this (xamux); just think about it (после этих слов обычно идёт сильное шокирующее утверждение Ivan Pisarev)
глубоко задуматься v
gen.	be deep in thought; deep in thought
задумайся! v
gen.	think it over! (Andrey Truhachev)
задумавшись v
gen.	absently (sever_korrespondent)
задумал v
gen.	came up with (Tanya Gesse)

задуматься: 169 phrases in 16 subjects

Abbreviation	1
Bookish / literary	1
Business	2
Cliche / convention	2
General	106
Idiomatic	2
Informal	6
Literature	4
Makarov	30
Mathematics	3
Neologism	1
Philosophy	1
Psychology	1
Rhetoric	1
Scientific	5
Slang	3