acostumbrar
/akostumˈbɾaɾ/ · B1 · verb
to use to
a + costumbre (custom): bring someone to a custom — cousin of accustom
Built from a- (to) + costumbre (custom, habit) + verb ending -ar. English accustom has the same Latin root, consuetudo. Acostumbrarse a = get used to; acostumbrar + infinitive = be in the habit of doing.