The term 'swallow up' can be defined as engulfing or absorbing something. This is reflected in the two crossword solutions for the term, which are 'ENGULF' (6 letters) and 'ABSORB' (6 letters). Engulfing and absorbing are both processes of taking something in, either physically or metaphorically. In physical terms, it can refer to a large object or force consuming a smaller one, while metaphorically it can refer to an idea or concept being taken in and accepted.