This is the 6673rd most frequent Chinese word.
松劲
To relax or ease up.
松劲 in this sentence means to slack off or relax in terms of effort, indicating a reduction in intensity of action.
在比赛的最后阶段，他开始松劲了。
In the final stage of the competition, he started to slack off.
Here, 松劲 is used to suggest relaxation or easing off after intense effort, showing a moment of deserved rest.
完成任务后，可以稍微松劲一下。
After completing the task, you can relax a bit.
In this use case, 松劲 refers to the action of diminishing effort or relaxation that could lead to negative consequences if done improperly.