Reconstruction:Proto-Slavic/lopъ

Of onomatopoeic origin, akin to *lopati (“to rattle, to clap, to gulp”). Equivalent to *lo- (“strike, fracture”) +‎ *-pъ, from some pre-Slavic expressive root such as Proto-Indo-European *h₃elh₁- (“fall, collapse”). The secondary meaning gulping, devouring is comparable with Proto-Germanic *lapōną (“to lap”), itself of onomatopoeic origin.

*lòpъ m

1. splash, knock, clap

   Synonyms: *xlopъ, *plěskъ, *trěskъ

2. sound of gulping/devouring

• *lopotь, *lopota (“rag, tatter, frazzle cloth”)
• *lopьjь (“torrent, downpour”)
• *lopъka (“clot, wad”)
• *lopъta (“file, ball, pill”)

• East Slavic:
  • Belarusian: лоп (lop)
  • Russian: лоп (lop) (colloquial)
  • Ukrainian: лоп (lop)
• South Slavic:
  • Bulgarian: лоп-лоп (lop-lop), figr. лоп (lop, “robbery, plunder”)
  • Serbo-Croatian:

    Cyrillic: ло̏п

    Latin: lȍp

  • Slovene: lòp

• Vasmer (Fasmer), Max (Maks) (1964–1973), “лопок”, in Etimologičeskij slovarʹ russkovo jazyka [Etymological Dictionary of the Russian Language] (in Russian), translated from German and supplemented by Trubačóv Oleg, Moscow: Progress
• Trubačóv, Oleg, editor (1990), “*lopъ I”, in Etimologičeskij slovarʹ slavjanskix jazykov [Etymological dictionary of Slavic languages] (in Russian), volume 16, Moscow: Nauka, page 77
• Georgiev Vl. I., editor (1986), “лоп-лоп”, in Български етимологичен речник [Bulgarian Etymological Dictionary] (in Bulgarian), volume 3, Sofia: Bulgarian Academy of Sciences, page 470
• Snoj, Marko (2016), “lópiti”, in Slovenski etimološki slovar, Ljubljana: Inštitut za slovenski jezik Frana Ramovša ZRC SAZU, →ISBN: “*lop”

From Proto-Balto-Slavic *lapas[1], cognate with Lithuanian lãpas (“leaf”), Latvian lapa (“leaf, sheet of paper”). Probably also akin to Proto-Germanic *lappô (“lap, rag”) and Proto-Germanic *lattō (“lath, shutter, board”).

*lopъ m

1. leaf

   Synonym: *listъ

2. (regional) plant/herb with big leaves (e.g. water rose or butterbur)

• *lopuxъ (“burdock”)
• *lopurъ (“water lilly”)
• *lopěnъ (“mullein”)
• *lopata (“shovel”)
• *lopatařь (“racket”)
• *lopatarъ (“shovel head, by ext.: fallow deer”)

• South Slavic:
  • Bulgarian: лоп (lop, “butterbur”)
  • Macedonian: лоп (lop, “water rose, g. Nymphaea”)

• Trubačóv, Oleg, editor (1990), “*lopъ II”, in Etimologičeskij slovarʹ slavjanskix jazykov [Etymological dictionary of Slavic languages] (in Russian), volume 16, Moscow: Nauka, page 77
• Georgiev Vl. I., editor (1986), “лоп¹”, in Български етимологичен речник [Bulgarian Etymological Dictionary] (in Bulgarian), volume 3, Sofia: Bulgarian Academy of Sciences, page 470