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друг другу stresses
gen.	each other; to one another
math.	generality and precision sometimes oppose one another
proverb	one another
unions.	for one another (Кунделев)
друг друга
gen.	each other; one another; each (обычно о двух); of one another; each other's; one another's
math.	mutually
в сложных словах имеет значение друг друга
biol.	allelo

друг другу: 4445 phrases in 198 subjects

Abbreviation	3
Accounting	2
Acoustics	1
Advertising	5
Aerohydrodynamics	3
Affectionate	1
Agriculture	3
American usage, not spelling	38
Antennas and waveguides	4
Arabic language	2
Architecture	11
Armored vehicles	2
Art	1
Artificial intelligence	2
Astronautics	3
Astronomy	1
Audit	1
Australian	8
Automated equipment	12
Automobiles	19
Aviation	11
Aviation medicine	3
Banking	8
Bible	4
Billiards	1
Biology	7
Black slang / African-American Vernacular	2
Bookish / literary	3
Botany	1
British usage, not spelling	10
Business	19
Cables and cable production	6
Caspian	3
Cement	1
Chat and Internet slang	1
Chemistry	4
Chess	20
Christianity	8
Cinematography	6
Cliche / convention	3
Communications	3
Computer games	1
Computer networks	3
Computers	2
Construction	18
Contextual meaning	2
Cooking	2
Criminal jargon	2
Cultural studies	1
Cycling other than sport	2
Dialectal	9
Diplomacy	23
Disapproving	3
Dog breeding	8
Ecology	6
Economy	11
Education	2
Electrical engineering	7
Electronics	10
Energy industry	1
Ethnology	1
European Bank for Reconstruction and Development	2
European Union	1
Explanatory translation	4
Felinology	3
Figurative	6
Figure of speech	8
Finances	4
Firefighting and fire-control systems	1
Foreign affairs	3
Foreign policy	2
Forestry	3
French	3
Furniture	1
General	2052
Geology	10
Geometry	1
Gold mining	2
Gymnastics	8
Heraldry	4
Historical	1
Hotel industry	1
Human resources	1
Humorous / Jocular	6
Idiomatic	53
Informal	82
Information technology	8
Insurance	1
Intelligence and security services	1
International relations	1
Internet	17
Invective	2
Investment	1
Irish	3
Ironical	10
Jargon	2
Jewelry	2
Laser medicine	1
Latin	6
Law	37
Leather	1
Librarianship	1
Linguistics	5
Literature	13
Lithology	1
Logistics	3
Makarov	784
Management	1
Marketing	2
Mass media	81
Mathematics	76
Mechanic engineering	36
Mechanics	3
Medical	9
Metallurgy	2
Metrology	3
Microsoft	12
Military	11
Mining	12
Modern use	1
Music	2
Name of organization	3
Nautical	14
Navigation	4
Neologism	1
Non-governmental organizations	1
Notarial practice	3
Numismatics	1
Obsolete / dated	10
Occupational health & safety	2
Oceanography & oceanology	6
Office equipment	1
Oil / petroleum	4
Oil and gas	2
Oil and gas technology	1
Packaging	3
Patents	5
Pets	3
Pharmacology	1
Philosophy	1
Physics	2
Poetic	2
Police	1
Politics	8
Polygraphy	19
Polymers	1
Production	4
Professional jargon	1
Programming	47
Proper name	1
Proverb	171
Psychiatry	5
Psychology	18
Pulp and paper industry	1
Quotes and aphorisms	29
Rail transport	8
Religion	18
Rhetoric	1
Road works	4
Sakhalin	1
Sakhalin R	1
SAP	1
Saying	4
Scientific	8
Security systems	2
Seismology	2
Shipbuilding	4
Shooting sport	1
Short message service	1
Slang	108
Social media	10
Sociology	1
Software	2
Spanish	1
Sports	6
Stock Exchange	1
Sublime	6
Taxes	1
Technology	28
Teenager slang	2
Telecommunications	6
Textile industry	2
Tibetan	3
Trade unions	3
Traffic control	3
Transport	10
Tribology	2
Uncommon / rare	3
United Nations	1
United States	2
Vernacular language	1
Vulgar	14
Water resources	1
Water supply	1
Welding	5
Wood processing	15
Yachting	1
Zoology	1