並べる

The regular 下一段活用 (shimo ichidan katsuyō, “lower monograde conjugation”) shift of Old Japanese and Classical Japanese verb 並ぶ (narabu, “to line up (intransitive); to line something up (transitive)”).^[1][2]

The root verb narabu appears in Old Japanese, at least as early as the Man'yōshū of 759 CE.^[1][2]

Probably reflecting the same nara root as verb 均す・平す (narasu, “to flatten something out, to line something up horizontally”) + ぶ (bu, suffix attaching to nouns and adjectives to indicate ongoing state or likeness). If so, probably deriving ultimately from verb 成る・為る・生る (naru, “to come into being; to become”), 慣る・馴る・狎る・熟る (naru, “to become normal, to become regular, to become fitting”, classical form of modern なれる (nareru)).

• (Tokyo) ならべる (Heiban – )^[2][3][4]
• IPA^(key):

並(なら)べる • (naraberu) transitive ichidan (stem 並(なら)べ (narabe), past 並(なら)べた (narabeta))

1. to line something up
2. to arrange things, to set up

• 並(なら)ぶ (narabu): to line up (intransitive)