1 sentence for 出线 (chū​xiàn — out of bounds)

1. 你在给这个图案填色的时候，笔尖注意不要出线。

   nǐ zài gěi zhè​ge tú'àn tián​sè de shí​hou, bǐ​jiān zhù​yì bù yào chū​xiàn.

   When coloring this pattern, be careful not to let the tip of your pen go outside the lines.

   Source: Dong Chinese Dictionary