To upset the composure of.
To bring into confusion.
To frustrate, discomfit.
A state of disunion.
To express contempt.
To try to attract birds by making a sibilant noise (e.g. "psshh").
A sibilant noise (e.g. "psshh") made by birders and ornithologists to attract small birds.
Of poor quality; very bad.
Expressing disdain.