/slɪp/
[verb] To slide suddenly and accidentally, losing your balance or grip on a surface. It can also mean to move quietly and quickly, or to make a small mistake without meaning to.
The word 'slip' once described eels sliding through water — making it one of English's most literally slippery words.
The word 'slip' entered English in the 14th century, most likely borrowed from Middle Low German 'slippen' or Middle Dutch 'slippen', both meaning 'to slide' or 'to glide'. These Germanic forms trace back to a Proto-Germanic root reconstructed as '*slipan', which carried the essential idea of smooth, uncontrolled movement across a surface. This same ancient root gave Old High German 'slifan' (to glide) and is distantly related to words for eel-like, slick creatures in several northern European languages — animals whose defining quality was exactly this kind of effortless, wet sliding.
The Proto-Germanic root itself reaches further back to a Proto-Indo-European base '*sleybh-' or '*slei-', meaning 'slimy' or 'slippery'. This ancient root is the ancestor of a surprising family of English words. Latin 'limus' (mud, slime) shares this heritage, and from Latin we get 'slime' through Old English 'slim'. The PIE root also produced Greek 'olismos' (a slipping), showing how widely this concept of wet, uncontrolled movement spread across ancient languages.
When 'slip' first appeared in Middle English, it was used almost entirely in a physical sense — feet slipping on wet ground, a knife slipping from a hand, a boat slipping from its moorings. Writers of the 14th and 15th centuries used it to describe the movement of eels, fish, and other creatures through water, making the word feel alive with natural, organic energy. The connection to water and wet surfaces was so strong that early speakers would have immediately pictured mud or rain when they heard the word.
By the 15th and 16th centuries, the meaning began to expand in interesting directions. 'Slip' started to mean moving quietly and secretly — a person could 'slip away' from a crowd or 'slip out' of a room unnoticed. This shift makes perfect sense: just as a wet object slides without friction, a careful person moves without drawing attention. Shakespeare used the word freely in this way, and it became a favourite of writers describing spies, lovers, and thieves moving through the shadows.
The idea of a small mistake — 'a slip of the tongue' or 'a slip of the pen' — came later, flowering fully in the 16th and 17th centuries. Here the logic is beautifully consistent: a mistake is something your mind or hand does without intending to, just as a foot slides without you choosing it. Sigmund Freud famously explored 'slips' in his 1901 work on psychopathology, and the term 'Freudian slip' entered everyday English in the 20th century, giving the old word a striking new life in the language of psychology.
Today 'slip' has branched into dozens of uses: a slip of paper, a petticoat slip, a plant cutting, a ship's berth, a cricket fielding position, and the phrase 'give someone the slip'. Each meaning carries a trace of that original idea — something small, quick, smooth, and slightly out of control. Few English words have slid so gracefully through so many meanings while keeping their original feeling so perfectly intact.