CJK Unified Ideograph-9F77

It usually points to 齷齪, not a complete message.

齷 pairs tooth-related 齒 with sound-bearing 屋, and old glosses explain 齷齪 as teeth standing close or fine: the starting logic is tight and cramped, with 偓促 and forms like 齷促 and 握齪 belonging to the same family.

Why does 齷齪 change meaning by language?

Chinese and Japanese kept different branches of the same word-family.

In the Southern Dynasties, Bao Zhao uses 齷齪 for a cramped, small-minded person; in the Tang period, Wang Bo turns it on the cramped human world, and Chinese dictionaries keep dirty, morally vile, and narrow-minded senses.

Japanese took the busy branch: あくさく is dated to 1445–46 and the shifted あくせく to 1746–48, meaning fussy, hurried busyness, while a Chinese-derived dirty-or-ugly sense is recorded separately in 1761.

Use the compound, not the orphan

Use 齷齪 when the word is what you mean.

Alone, 齷 cannot choose its reading: the compound does the work, the surrounding language decides petty and dirty versus fretfully busy, and simplified Chinese writes it as 龌龊. If someone sends only 齷, treat it as a fragment until context supplies the missing half.