No definitions, no sources (box not applicable)

Hello, a colleague of mine is leading a childcare organization in Germany. More and more parents call and ask questions in English which is not her first language. Is there a special dictionary where the most important terms of this work area are collected, eg 'sich eingewöhnen' = 'get accustomed', 'Abrechnung' = 'settlement'. Probably there isn't such an overview, but who knows. My attempts to find such a thing in Google were unsuccessful. Thanks.