the world > action or operation > behaviour > customary or habitual mode of behaviour > act habitually [verb (intransitive)] > be accustomed to do something > of things (2)
to door be…gladly: to be accustomed or ‘apt’ to. (Cf. Greek ϕιλεῖν to love, to be accustomed.) Obsolete.
In uses not referring to past actions. Now Caribbean (chiefly in Trinidad and Tobago). In affirmative contexts without do-construction.