The initial idioms of the letter S

Slip me five!	slip mind
slip of the lip	slip of the tongue
slip off	slip on
slip one’s trolley	slip one over on
slip over on	slip one's mind
slip out	slip over
slip past	slip someone a Mickey
slip someone five	slip something over on
slip through	slip through fingers
slip through the cracks	slip through the net
slip trolley	slip under the/(someone's) radar
slip up	slip up on
slip beneath the/(someone's) radar	slippery
slippery as an eel	slippery customer
slippery slope	slipstick