The fourth character is the idiom of "bad". The last word of the four-character idiom ending with "bad" and its explanation:
Messy - describes disorder, disorganization, It was a mess.
Messy--described as very messy.
A mess--described as very messy.
To use wine as a pillow to borrow lees. Refers to alcoholism and drunkenness.
To borrow lees on the pillow - to rest on the wine and the lees. It is said to be addicted to alcohol and drunkenness.