How to Sign “Because” in ASL

The short answer

The commonly taught American Sign Language (ASL) sign for BECAUSE uses one hand. Touch your extended index finger to your forehead, then move your hand out to the side and slightly upward while closing it into a fist with your thumb up. This works as a single word for “because.” Fluent signers often use a different sentence structure instead, which is explained below.

This guide covers ASL only. Other sign languages, including Russian Sign Language and British Sign Language, are separate languages with their own signs. Do not assume the same sign carries over.

Step by step

• Use your dominant hand, the one you write with.
• Make a “1” handshape: index finger extended, other fingers curled, as if pointing.
• Touch or nearly touch your forehead with the tip of your index finger, slightly toward the side of your head.
• Move your hand away from your head, out to the side and a little upward.
• As your hand moves, curl the index finger in so the hand ends as a fist with the thumb pointing up. In ASL this ending shape is called an “A” handshape.
• Keep it to one smooth motion rather than two separate movements.

Variations you may see

Some signers start with a flat or slightly open hand at the forehead instead of a single index finger. Others make the movement smaller or do not fully close the hand. Like spoken words, signs can vary by region, community and signing speed. No specific source material was supplied for this guide, so treat the description above as the commonly taught form. Confirm it against an ASL video dictionary or with a Deaf signer, especially if you are learning for a particular community or class.

Fluent signers often skip the word

English uses “because” constantly, but ASL often expresses a reason another way. A common pattern is to state the situation, ask a rhetorical WHY? with raised eyebrows, then give the reason.

English: I stayed home because I was sick.
ASL gloss: ME STAY HOME, WHY? SICK.

A gloss is a written approximation of signs using English words in capitals. It does not capture facial expression or movement. The BECAUSE sign is understood and correct. Learning the rhetorical-question pattern as well will help you follow natural conversation.

Checking your sign on camera

If you are practicing in front of a webcam or signing on a video call, check two things.

• Framing: keep your whole head and some space beside it in view. BECAUSE starts at the forehead and travels outward, so a tight crop on your face can cut off the end of the sign.
• Mirroring: many video apps show you a mirrored self-view. On your screen your hand may appear to move the opposite way from what the other person sees. This is normal. Sign naturally with your dominant hand and judge the movement by how it feels, not by the mirrored preview.

To verify your result, record a short clip and compare it side by side with a video dictionary entry. Look at three things: the starting handshape at the forehead, the direction of movement and the closed thumb-up ending. If a Deaf signer or teacher is available, their feedback is the most reliable check.