Go on the offensive is a phrase that means to take an aggressive stance in a situation. It can be used in a variety of contexts, such as in sports, politics, or business. The crossword solution for this phrase is 'ATTACK, ' which is a six-letter word. ATTACK implies taking action with the intention of causing harm or damage to another person or entity. It is often seen as a hostile act and is usually done with the goal of gaining an advantage over the other party.