How to Sign "Upon": Why Meaning Comes Before the Sign

The short answer

Most sign languages, including American Sign Language (ASL), don't have one fixed sign that translates "upon" every time. Sign languages are independent languages with their own grammar, not word-for-word codes for English. You translate what "upon" means in your sentence, and that meaning can change from one sentence to the next.

In practice, "upon" usually carries one of three meanings, and each is handled differently:

• Physical position ("the book lay upon the table"): this means the same as "on." ASL commonly uses its sign for ON. The dominant flat hand rests on the back of the other flat hand, with both palms facing down. Signers often go further and show where the object sits by placing it in the signing space.
• Timing ("upon arrival," "upon hearing the news"): this means "when" or "as soon as." It is usually expressed through sentence structure, such as signing the first event, then the event that follows. A sign like WHEN or FINISH may link the two. There is no literal "upon."
• Set phrases ("once upon a time"): signers translate the whole phrase, not each word. Storytellers in ASL often use a sign meaning "long ago" or a similar story-opening convention.

Which sign language you are using also changes the answer. ASL, British Sign Language and Russian Sign Language are separate languages with different vocabularies. A sign that works in one may mean nothing, or something else, in another. Signs can also vary by region and community.

Working out your sentence step by step

• Identify the sign language your audience uses.
• Replace "upon" with a plainer English word: "on," "when," "as soon as" or "after." If none of these fits, treat the expression as an idiom.
• Look up that concept, not the word "upon," in a dictionary for your sign language.
• Consider whether placement, ordering or facial expression conveys the meaning better than a separate sign.
• Ask a fluent or Deaf signer to confirm your phrasing, especially for anything formal or public.

Fingerspelling U-P-O-N is possible, but it is generally not how fluent signers express the idea. Keep it for situations where you are specifically discussing the English word.

Checking your signing on camera

If you plan to sign on a video call or record a practice clip, check three things separately:

• Camera access: the browser or app has permission to use the camera.
• Capture: a live image actually appears.
• Clarity: your signs are readable to the viewer.

A working camera does not by itself mean your signing will be readable. Record a short test and watch it back. Look for these points:

• Your hands, upper body and face all stay in frame. Facial expression is part of the grammar, and signs placed on the back of the other hand, like ON, sit low in the signing space.
• The light falls on your front, not from a window behind you, so your hands aren't silhouetted.
• The background is plain and contrasts with your skin tone and clothing. A busy physical background makes hand shapes harder to follow.
• Virtual background or blur effects don't clip or smear your moving hands. If they do, turn the effect off and use a plain physical background instead.

What this guide can't confirm

This guide relies on general principles of how sign languages work. It isn't based on a verified dictionary entry for every regional variant. Hand descriptions in text also can't show movement, orientation and facial grammar the way video can. Treat the examples above as a starting point, and check them against a recognized dictionary for your sign language or with a fluent signer before relying on them.