There are many different ASL signs for the English word "open", such opening a door, a window, a book, and so on, usually using a classifier in a verb phrase.
How to sign "open" in American Sign Language (ASL)? For other ASL sign-words or inflections for the word 'open', see synonyms or related words.
Definition: not closed or barred at the time, as a doorway by a door, a window by a sash, or a gateway by a gate; not shut or blocked; not closed.
Pronunciation (sign description): Both "B" hands, palms down, edge of hands in contact or near contact, diverge outward/upward where the palms face upward and hands are held apart in space.
Usage examples: This sign can refer to an abstract concept, not necessarily limited to physical-related concepts. "The poetry slam competition opens at 7am".
Related signs: AJAR, UNLOCKED,
The signword above is modulated slightly different to indicate that something is "accessible" or "offered without restriction".
Usage example: "the event is open to everyone".
Meaning: (of a person) frank and communicative; not given to deception or concealment.
Synonyms: FRANK, HONEST, CANDID, DIRECT.
Use classifiers for the following examples: door, window, containers, drawer, cabinet, etc.
First 100 words.
As you feel more comfortable with the first few hundreds of ASL signs, progress further with your vocabulary and learn signing more.