Last checked: August 2026 · Written by the player-led team at Badminton House
Quick answer
A line judge calls out with both arms horizontal, points at the line without speaking for in, and covers their eyes when unsighted. For a server-delivery service fault, the service judge calls Fault aloud and makes the approved hand signal; the umpire then gives the explanatory call.
Start with What line-judge signals mean
Read the official’s role before interpreting the signal. A line judge’s visible signal answers a line-decision question; for a service-law fault, the service judge’s audible Fault call and hand signal come before the umpire’s acknowledgement and explanation.
- For a line decision, first identify whether the official points at the line, extends both arms horizontally, or covers the eyes.
- Match the signal to in, out, or unsighted before adding score or service-fault language.
- For a server-delivery service issue, listen for the service judge’s Fault call, then distinguish the hand signal from the umpire’s explanation.
- When a call remains unclear, use current official material rather than converting a gesture into a player-made rule.
Related reading: How to Be a Badminton Line Judge: Signals and Calls — for the line-judge signals that differ from umpire vocabulary.
What line-judge signals mean
A line judge signals Out with both arms extended horizontally, signals in silently by pointing at the line, and covers both eyes when unsighted. Read the observed arm position before assigning an outcome, because the three signals do not mean the same thing. BWF technical-official guidance
The practical distinction is narrow but useful. A line judge is reporting a boundary observation, so the signal answers only whether that judge saw the shuttle in, out, or not well enough to decide. It is not a score announcement, a service ruling, or an invitation for players to replay the rally from a hand gesture alone.
What follows a service-judge fault
When the server's delivery is a service-law fault, the service judge calls Fault loudly and makes the approved hand signal; the umpire then acknowledges that service fault with the relevant explanatory vocabulary. Separate the service judge’s audible call and signal from the umpire’s explanation: they are connected but not interchangeable roles. BWF vocabulary and BWF technical-official guidance
For players, the useful sequence is to identify the official closest to the service action, hear the Fault call, see the accompanying approved signal, and then listen to the umpire’s explanation. That order is a way to understand a decision after it happens; it is not a player procedure for officiating a club rally or disputing an appointed official.
The hand signal is not a substitute for the spoken call, and the umpire’s explanatory words are not a second line-judge decision. Each part belongs to the service-fault process described in the official materials. Keeping the steps attached to their roles makes the sequence easier to recognise without inventing a meaning for an unfamiliar local gesture.
Spoken vocabulary around an official call
BWF standard vocabulary includes service over, fault, let, out, interval, play a let, and change ends. Those words support official communication around a call, but they do not turn a recreational club habit into an official signal or replace the Law that governs it. BWF vocabulary
A vocabulary word only becomes useful when its speaker and situation are clear. For example, out is part of a line decision, while fault can arise in the service-judge process. Let, interval, play a let, service over, and change ends belong to other match moments. The same word list therefore does not make every official a source for every decision.
Use one role map
Identify the official and the decision being communicated before interpreting a gesture or word. A line observation, a service-delivery fault and the umpire’s explanation are different parts of officiating.
Standard vocabulary such as service over, fault, let, out, interval, play a let, and change ends supports official communication, but it does not turn an unfamiliar local gesture into an official BWF signal.
Questions the cited sources do not settle
- A recreational club habit as an official BWF signal.
- A claim that line judges verbally call in or that every hand signal belongs to the umpire.
What to do next
When a signal is unclear, use current official material and defer to the appointed official in a live match rather than turning a gesture into a player-made rule.
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