Character for "□" 西南官话 kuai³¹: "～着走, 两脚尖向内地走"
There could be two answers to this question.

1.拐 can pronounced as kuai in some dialects. For example, in Lufeng dialect, it's pronounced as kuai3.

2.擓(pronounced as kuai3 in Mandarin, Unicode:U+64D3).

This character has three meanings:

First, in some dialects it means scratch, such as ShanDong dialect and Mandarin of Jianghuai.

Second, in others dialects it means carrying on arm, it's used as a synonym for 挎(kua2). In this sense, it can be interpreted as an adjective. To describe the posture that deliberately lift legs in walking.

Third, it means ladle out.

When we use the second meaning, it could be written in the common sayings(一～一～).

Sorry for my terrible English. Hope my answer is helpful.