The term 'power grab' can be defined as an attempt to gain control or authority over something. In this case, the crossword solution for the term is 'COUP, ' which is a French word meaning 'BLOW' or 'STROKE.' A COUP is a sudden, often violent, seizure of power from a government or organization. It is usually carried out by a small group of people who are attempting to overthrow the existing government or leadership.