Catch up is a phrase that can be used in many different contexts. In this case, the crossword solutions GRIP (4 letters), FASCINATE (9 letters), ENMESH (6 letters) and ENTANGLE (8 letters) all have meanings related to the term catch up. GRIP is to hold something firmly, FASCINATE is to captivate someone's attention, ENMESH is to trap or ensnare something, and ENTANGLE is to become involved in a complicated situation. All of these words can be used to describe the act of catching up with someone or something.