“slip” in this case means “mistake” or “accident” and it is a metaphor … for the “slip” that actually means “trip” or “fall”

faux pas: a socially awkward or tactless act

a minor inadvertent mistake usually observed in speech or writing or in small accidents or memory lapses etc.

potter’s clay that is thinned and used for coating or decorating ceramics

cutting: a part (sometimes a root or leaf or bud) removed from a plant to propagate a new plant through rooting or grafting

a young and slender person; “he’s a mere slip of a lad”

mooring: a place where a craft can be made fast

steal: move stealthily; “The ship slipped away in the darkness”

an accidental misstep threatening (or causing) a fall; “he blamed his slip on the ice”; “the jolt caused many slips and a few spills”

insert inconspicuously or quickly or quietly; “He slipped some money into the waiter’s hand”

slickness: a slippery smoothness; “he could feel the slickness of the tiller”

strip: artifact consisting of a narrow flat piece of material

skid: move obliquely or sideways, usually in an uncontrolled manner; “the wheels skidded against the sidewalk”

a small sheet of paper; “a receipt slip”

get worse; “My grades are slipping”

chemise: a woman’s sleeveless undergarment

move smoothly and easily

case: bed linen consisting of a cover for a pillow; “the burglar carried his loot in a pillowcase”

err: to make a mistake or be incorrect

skid: an unexpected slide

pass on stealthily; “He slipped me the key when nobody was looking”

pass out of one’s memory

a flight maneuver; aircraft slides sideways in the air

the act of avoiding capture (especially by cunning)

dislocate: move out of position; “dislocate joints”; “the artificial hip joint luxated and had to be put back surgically”

Slip can mean a type of undergarment that is worn under a dress. “Her slip was showing under the black dress.”

Slip can mean to fall. “Be careful not to slip on the icy sidewalk”

Slip can mean to say something wrong. “He let is slip that she was going to quit her job”

Slip can mean to give someone something. “Slip the paper under the door to his office so he will get it first thing in the morning.”

Slip is also really watery clay when you are working with ceramics.

There could be more meanings- I just thought of these ones. You could try google dictionary if you need more meanings.