kick

The word 'kick' appeared in Middle English around the 14th century as 'kiken,' and its origins remain genuinely mysterious.‍​‌​‌​‍​‌​‌​‌​‍​‌​‌​‌​‍​‍​‌​‍​‌​‌​‌​‌​‍​‌​‍​‍​‌​‌​‍​‍​‍​‌​‌​‌​‍ It has no clear Old English ancestor — the Anglo-Saxons used other words for the action of striking with the foot. The most common theory connects it to Old Norse 'kikna' (to bend at the knees, to sink at the knees), suggesting that the concept of a knee-bending motion evolved into the concept of a foot-striking motion. Other scholars have proposed that 'kick' is simply onomatopoeic — an imitation of the sharp, percussive sound of a foot connecting with an object.

The absence of an Old English predecessor is genuinely puzzling. Kicking is such a basic physical action that you would expect every language to have had a word for it from the earliest times. Old English had 'spurnan' (to kick, to spurn — the same word that gives us 'spurn,' originally 'to kick away') and 'cnocian' (to knock, to strike), but neither survived as the primary word for kicking. 'Kick' displaced them both with a completeness that suggests it named the action more vividly or precisely than its predecessors. Whatever 'kick' meant when it entered English, speakers recognized it immediately as the right word for the right action.

If the Norse connection through 'kikna' is correct, the semantic development is interesting. 'Kikna' described the involuntary bending of the knees — stumbling, buckling, going weak in the legs. The shift from 'knees bending' to 'foot striking' would involve a reversal of energy: from collapse to propulsion, from receiving force to delivering it. This is speculative but not unprecedented — many words for striking derive from words for bending or swinging motions, since a kick is essentially a controlled swing of the leg from the knee or hip.

The onomatopoeic theory has a different appeal. The hard 'k' sounds at the beginning and end of 'kick' do sound percussive, and the short 'i' vowel in the middle gives the word a sharpness that matches the action. Compare 'kick' with its Germanic cousins: Dutch 'kijken' (to look — probably unrelated), Norwegian 'kike' (to peep). The word feels invented to sound like what it means, which is exactly what onomatopoeia does. Many basic action words have onomatopoeic origins or onomatopoeic reinforcement — 'splash,' 'crash,' 'bang,' 'crack,' 'slap' — and 'kick' may belong to this company.

Whatever its origin, 'kick' has become one of the most versatile words in English, spawning an extraordinary number of idiomatic expressions. To 'kick the bucket' (to die — origin disputed, possibly from a method of suicide or slaughter), to 'get a kick out of' something (to enjoy it — possibly from the stimulating jolt of alcohol), to 'kick off' (to begin — from football), to 'kick back' (to relax, or a bribe), to 'kick around' (to discuss casually, or to abuse), to 'kick start' (to begin forcefully), to 'kick the habit' (to overcome an addiction), to 'kick upstairs' (to promote someone to a less influential position) — the word has generated an entire idiomatic ecosystem.

The physical sensation of being kicked has made the word a powerful metaphor for sudden, forceful impact of any kind. A spicy food 'has a kick.' A cocktail 'kicks.' An emotional realization can 'kick you in the gut.' A delayed consequence 'kicks in.' In each case, the word contributes its core qualities: suddenness, force, and the slight shock of unexpected impact. These are the qualities that made 'kick' so successful when it entered English — it named not just the physical action but the experiential quality of sudden forceful contact.

In sport, 'kick' has become central to the vocabulary of football (both association and American), martial arts, rugby, and swimming. The 'free kick,' the 'penalty kick,' the 'drop kick,' the 'bicycle kick' — each describes a specific technique, but all share the fundamental action of propelling with the foot. It is remarkable that a word of uncertain origin and relatively late entry into English should have become so dominant in describing one of humanity's most basic physical capabilities. The mystery of where 'kick' came from only adds to its character — a word as sudden and forceful as the action it names, arriving without warning and immediately making itself indispensable.