Wurdahuzdą: Proto-Germanic dictionary — *wallanąScott K. ShayWardja Presshttps://protogermanic.org/pgmc_wallaną
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verbStrong class 7cto well up, spring out, bubble forthFrom Pre-Germanic *wolH-n- (‘to undulate’), an o-grade intensive formation. Both *wallaną and e-grade *wellaną (‘to well up’) were probably created to the archaic zero-grade present *wulaną (‘idem’).