The antonyms for the phrase "break train thought" can be described as continuous, uninterrupted, and cohesive. When we use the opposite of "break train thought", our thoughts stay intact and cohesive, and we can continue to focus on task or idea at hand, without any interruptions or distractions. This kind of concentration is essential, especially when we are trying to brainstorm new ideas or complete a project. It helps us stay on track and prevents us from losing sight of the bigger picture. Therefore, it is crucial to cultivate habits and practices that encourage uninterrupted train of thought for better productivity and success.