This is the 5725th most frequent Japanese word.
ついと
The word "ついと" does not exist as a standard Japanese term. It may be a typo or slang.
In this sentence, 'ついと' reflects a sudden movement or action with a sense of purpose or directed intent.
彼女はついと私の方を向いた。
She suddenly turned toward me.
Here, 'ついと' emphasizes the abruptness or quickness of the disappearance.
その姿がついと消えてしまった。
That figure suddenly disappeared.
'ついと' in this context indicates the swift and unassuming appearance of the smile.