Origins
The English word 'suspend' entered the language around 1290, from Old French 'suspendre,' which descended from Latin 'suspendere' (to hang up, to cause to hang). The Latin verb combines 'sus-' (a form of 'sub-,' here meaning 'up from below') and 'pendere' (to hang), creating the sense of lifting something up and leaving it hanging.
The prefix 'sub-' in Latin had a range of meanings, and in 'suspendere' it functions differently than in words like 'suppress' or 'subtract.' Here 'sub-' means 'up from underneath' — to reach up and hang something from a hook, a beam, or a ceiling. The resulting image is of something lifted up and left dangling, free of the ground but not resting anywhere, held in a state between attachment and release.
The physical sense was primary in Latin and in early English. To suspend a lamp from a ceiling, to suspend a bridge from cables, to suspend a coat from a hook — these are direct descendants of Latin 'suspendere.' Suspenders (British: braces) are literally devices for suspending trousers from the shoulders. A suspension bridge is a bridge that hangs from cables.
Figurative Development
The figurative senses developed from the physical image. When a process or rule is 'suspended,' it is lifted out of its normal operation and left hanging — not cancelled or destroyed, but held in abeyance, removed temporarily from the ground of ordinary function. A suspended sentence in law is a punishment that hangs over the convicted person without being carried out (unless they reoffend). A student suspended from school is removed from their normal position and left dangling — neither expelled permanently nor fully reinstated.
The word 'suspense' (from Latin 'suspensus,' hung up) captures the psychological dimension of suspension. To be in suspense is to be emotionally hanging — suspended between two possible outcomes, unable to touch the solid ground of certainty. The suspense of a thriller, a courtroom verdict, or an election night is the feeling of dangling between hope and dread. This usage dates to the fifteenth century and has become one of the most evocative words in the English language.
In chemistry, a 'suspension' is a mixture in which particles are dispersed throughout a fluid but are not dissolved — they hang in the liquid, neither sinking to the bottom nor dissolving into the medium. This scientific sense (eighteenth century) perfectly preserves the Latin image: suspended particles are neither settled nor integrated.
Later History
In music, a 'suspension' is a compositional technique in which a note from one chord is held (hung over) into the next chord, where it creates a dissonance before resolving downward. The suspended note hangs, creating tension, before finally falling to its resolution. The musical suspension is a sonic enactment of the word's etymology.
Automotive suspension — the system of springs, shock absorbers, and linkages connecting a vehicle to its wheels — also uses the word precisely: the vehicle body is suspended above the road surface, hanging from the suspension components.
The Latin root 'pendere' connects 'suspend' to a large family. Where 'depend' is hanging down from, 'suspend' is hanging up. 'Append' is hanging onto. 'Impend' is hanging over. Each prefix redirects the basic image of hanging in a different spatial direction, generating a different metaphorical meaning.
Legacy
The legal phrase 'habeas corpus' can be suspended — meaning the right to challenge unlawful detention is hung up, temporarily removed from operation. Historically, governments have suspended habeas corpus during wars and emergencies, and the word choice is revealing: suspension implies the right still exists but has been lifted out of reach, hanging above the heads of citizens who can see it but cannot grasp it.