The term 'become rambunctious' can be broken down into six crossword solutions: UNRULY (6 letters), NOISY (5 letters), IMP (3 letters), ROISTER (7 letters), tamer (5 letters), and ROWDY (5 letters). UNRULY means disorderly or disobedient, while NOISY implies making a lot of sound. An IMP is a mischievous child, and to ROISTER is to engage in boisterous or drunken behavior. A tamer is someone who makes something less wild or aggressive, and ROWDY is similar to UNRULY, meaning disorderly or boisterous. Therefore, the phrase 'become rambunctious' can be interpreted as becoming disorderly, boisterous, and mischievous.