□
is the official place-marker for unknown or unwritable characters. Sometimes though there are appropriate characters for the mistakenly believed unwritable or nonexistent.
Here's my conundrum:
《现代汉语方言音库》
《成都话音档》
□
kuai³¹
~着走, 两脚尖向内地走
《成都方言词典》
《四川方言词典》
I'm willing to bet the missing character could be written 拐, but I haven't any proof.
What character could be written here instead of □?
kuai
. Maybe you can email the editor of the dictionary to confirm your speculation. – Stan Nov 28 '15 at 8:47