汉字: 碍
Pinyin: ài (fourth tone)
To hinder, obstruct, or block.
碍 is typically used to describe situations where progress or action is impeded by something or someone.
The radical 石 (stone) suggests the meaning of something physical or metaphorical that creates resistance or a barrier.
这个箱子太大，放在这里会碍路。
This box is too big and will block the way if placed here.
Imagine a stone (石) blocking the path, making it difficult to move forward, which relates to the concept of obstruction.