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ржа n stresses
gen.	fire blast (болезнь растений)
bot.	rust
Gruzovik, agric.	blight (disease)
met.sci.	rust (жарг. MichaelBurov); corrosion (жарг. MichaelBurov)
ржать v
gen.	neigh (о лошади); nicker (о лошади; мягче, чем neigh); hinny; whinny
agric.	roar
amer.	yock (Anglophile)
dial.	whicker
fig.	guffaw (about a person; to laugh boisterously SirReal)
Gruzovik, inf.	laugh loudly
inf.	hoot with laughter (informal denghu); break up (domestos); crack up (domestos); howl (domestos); cackle (смеяться Баян); hoot (domestos); laugh (Что ты ржёшь? Совсем не смешно. – What are you laughing about? It's not at all funny. (M. Berdy))
Игорь Миг, inf.	laugh one's head off
Ржу v
amer.	Thanks for the laugh (Himera)
"ржать" v
gen.	heehaw
ржу v
Игорь Миг	what a hoot!
ржа abbr.
gen.	rust (на хлебах)
РЖА abbr.
gen.	residential district agency (районное жилищное агентство aeolis)
Russian thesaurus
РЖУ abbr.
abbr.	районное жилищное управление
abbr., railw.	региональный железнодорожный узел (Elen Molokovskikh)
ржа abbr.
jarg.	ржавчина (MichaelBurov)
РЖА abbr.
abbr.	российская жилищная администрация

ржа: 113 phrases in 20 subjects

Agriculture	23
Animal husbandry	3
Biology	5
Economy	1
Food industry	4
General	27
Heraldry	1
Idiomatic	17
Informal	5
Internet	2
Literature	1
Makarov	4
Obsolete / dated	4
Phytophathology	3
Proverb	4
Rude	2
Slang	1
Technology	1
Titles of works of art	1
Winemaking	4