This character is a Other Letter and is mainly used in the Han script. The Unihan Database defines it as (same as 眨) to wink; (same as 睫) eyelashes, having one eye smaller than the other, joke; witticism; pleasantry; jest; fun; (Cant.) to peep at; to blink, wink. Its Pīnyīn pronunciation is jié.
The glyph is not a composition. Its East Asian Width is wide. In bidirectional text it is written from left to right. When changing direction it is not mirrored. U+4039 offers a line break opportunity at its position, except in some numeric contexts. The glyph can be confused with 3 other glyphs.
(same as 眨) to wink; (same as 睫) eyelashes, having one eye smaller than the other, joke; witticism; pleasantry; jest; fun; (Cant.) to peep at; to blink, wink