Slip

Slip: A dress-like silky/satin/tricot undergarment, generally worn to allow the hem of the outer garment to fall or "slip" into place. A half-slip is a skirt-like garment serving the same purpose. A slip also serves to make a dress or skirt less see-through or revealing if the outer garment does not have a liner.

In some European countries, the word slip is also used to refer to tight-fitting panties.

In USA a slip might also describe a nipple slip.

A slip of the tongue is an expression not about cunnilingus, but rather a misspoken word or phrase.