Proto-IE: *pAl[o]-, *plō-
Meaning: to fold
Old Indian: puṭa- m., n. `fold, pocket', puṭati `to clasp, fold'
Avestan: bifra- n. `Vergleich, Ähnlichkeit' ?
Old Greek: ha-plóo- `einfach, simplex', di-plóo- zweifsch etc., ha-plóō `entfalten, ausbreiten'
Latin: simplus, -a `einfach', duplus, -a `doppelt, zweifach', simplex, -icis `einfach, duplex, -icis `doppelt zusammengelegt'
Other Italic: Umbr dupla `binis', tupler `binis', tripler `triplis'; tuplak `furcam ?'
Celtic: *halt- > MIr alt `junctura, artus'
Russ. meaning: складывать (falten)
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