---
title: "BIP39 Word #642: expand — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/expand/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #642 01010000001 

# expand — BIP39 word #642

"**expand**" is word #642 of the 2048 words in the official BIP39 English wordlist, between [exotic](/bip39-word/exotic/) and [expect](/bip39-word/expect/). In a seed phrase it stands for the 11-bit value `01010000001`, decimal index 641\. 

/ɪksˈpænd/  · _verb:_ to become or make larger in size, number or amount 

[Russian](/ru/ "The BIP39 wordlist with Russian translations"): расширяться 

## Binary Representation

Three 1-bits and eight 0-bits; 165 of the 2048 indexes have exactly three 1-bits.

One wrong bit turns it into (leftmost bit first):

[south](/bip39-word/south/)[awake](/bip39-word/awake/)[ice](/bip39-word/ice/)[dizzy](/bip39-word/dizzy/)[flag](/bip39-word/flag/)[feature](/bip39-word/feature/)[fall](/bip39-word/fall/)[eye](/bip39-word/eye/)[expose](/bip39-word/expose/)[expire](/bip39-word/expire/)[exotic](/bip39-word/exotic/) 

Position

Hex Index

0x281

4-Letter Prefix

expa

## About "expand" in BIP39

- "expand" has 6 letters, but the first four, **"expa"**, already identify it, because **"exp"** also begins [expect](/bip39-word/expect/), [expire](/bip39-word/expire/), [explain](/bip39-word/explain/), [expose](/bip39-word/expose/) and [express](/bip39-word/express/).
- **"expa"** is unique only within the English list: it also begins expandir in the [Portuguese list](/portuguese/), so a four-letter backup should say which list it uses.

## Word #642 in the Other 9 BIP39 Wordlists

[Czech](/czech/) kopanec 

[French](/french/) éléphant 

[Italian](/italian/) femmina 

[Japanese](/japanese/) こせい 

[Korean](/korean/) 변호사 

[Portuguese](/portuguese/) dominado 

[Spanish](/spanish/) espía 

[Traditional Chinese](/chinese-traditional/) 創 

[Simplified Chinese](/chinese-simplified/) 创 

## Similar Words — Check Carefully During Recovery

Words sharing the first three letters "exp":

[expect](/bip39-word/expect/)[expire](/bip39-word/expire/)[explain](/bip39-word/explain/)[expose](/bip39-word/expose/)[express](/bip39-word/express/) 

## More BIP39 Words Starting with "E"

[ #638 exile ](/bip39-word/exile/)[ #639 exist ](/bip39-word/exist/)[ #640 exit ](/bip39-word/exit/)[ #641 exotic ](/bip39-word/exotic/)[ #643 expect ](/bip39-word/expect/)[ #644 expire ](/bip39-word/expire/)[ #645 explain ](/bip39-word/explain/)[ #646 expose ](/bip39-word/expose/) 

[View all words starting with "E" ](/bip39-words/e/) 

## Seed phrase, key and recovery guides

- [How to Restore a Wallet From a Seed Phrase: Step by Step](/restore-wallet-from-seed-phrase/)
- [xpub, ypub and zpub: Extended Public Keys Explained](/xpub-ypub-zpub/)
- [SLIP-39 vs BIP39: Shamir Backup and 20-Word Shares Explained](/slip39-vs-bip39/)

[ Full BIP39 Wordlist ](/)