The term 'burst inward' can be defined as the process of imploding, which is when an object collapses in on itself due to an internal force. The crossword solutions for this term are 'IMPLODE' (7 letters) and 'IMPLODED' (8 letters). Imploding is a phenomenon that occurs when an object is subjected to an internal force that causes it to collapse in on itself. This can happen due to a variety of reasons, such as a sudden decrease in air pressure or a sudden increase in temperature.