поперёк

From по- (po-) +‎ *перёк (*perjók, “crosswise”). Underlying root found in Old East Slavic перекъ (perekŭ, “width, crossbeam”) as well as Belarusian пе́рек (pjérjek, “across”); Ukrainian пере́ка (peréka, “contradiction”); Church Slavonic прѣкы (prěky, “across”); Bulgarian пря́ко (prjáko, “straight, across”); Serbo-Croatian при̏јек (“steep”); при̏јекӣ (“straight, nearest”); при̏јеко (“through”); Slovene prek (“across (adverb)”) (tonal orthography), also preko (tonal orthography); prèk (“across (preposition)”) (tonal orthography); Czech příka (“steepness”); příč (“width”); Slovak priek (“resistance”); Polish w poprzek (“across, crosswise”) or obsolete Polish przeko (“across”); Upper Sorbian prěki (“across”); Lower Sorbian pŕeki (“across”).

• IPA^(key): [pəpʲɪˈrʲɵk]

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поперёк • (poperjók) (+ genitive case)

1. across, athwart

поперёк • (poperjók)

1. across, crosswise

• пере́чить (peréčitʹ)
• попере́чник (poperéčnik)
• попере́чный (poperéčnyj)

• Vasmer (Fasmer), Max (Maks) (1964–1973), “поперёк”, in Etimologičeskij slovarʹ russkovo jazyka [Etymological Dictionary of the Russian Language] (in Russian), translated from German and supplemented by Trubačóv Oleg, Moscow: Progress
• Vasmer (Fasmer), Max (Maks) (1964–1973), “-перёк”, in Etimologičeskij slovarʹ russkovo jazyka [Etymological Dictionary of the Russian Language] (in Russian), translated from German and supplemented by Trubačóv Oleg, Moscow: Progress