slip
//slɪp//
Verb
to slide accidentally and lose one's balance or footing
She slipped on the ice and fell.
to move smoothly, quietly, or quickly, especially without being noticed
She slipped out of the room while no one was looking.
to fall to a lower level or standard; to decline or worsen
His grades slipped during the final semester.
to escape from or get free of something
The dog slipped its collar and ran away.
to put something somewhere quickly or quietly
She slipped a note into his pocket.
Noun
an act of sliding accidentally and losing one's balance
She had a slip on the icy sidewalk but didn't fall.
a small mistake or error
It was just a slip of the tongue.
a small piece of paper, typically for writing notes
She wrote her phone number on a slip of paper.
an undergarment worn under a dress or skirt
She wore a silk slip under her dress.
a decline or fall in level, quality, or performance
There has been a slip in sales this quarter.