"Bound" has four distinct etymological origins: (1) past participle of "bind" (fastened/obligated), (2) boundary/limit (Anglo-French bounde/bodne or Medieval Latin bodina, (3) ready/going (Old Norse búinn, and (4) to leap (French bondir).  These meanings merged over time from different Old English, Germanic, and French roots.  

According to the Oxford English Dictionary (OED), the word "bound" has different origins based on its meaning, with the earliest usage as an adjective bound (meaning ready/destined) appearing around 1175.  The noun bound (boundary/limit) appeared around 1275.  The adjective bound (tied/fastened) appeared around 1360.  The verb bound (to limit/confine) appeared around 1393 (in the writing of John Gower).  The noun bound (a leap/jump) appeared before 1556 (in the writing of Nicholas Udall).  The verb bound (to leap/jump) appeared in 1592 (in the writing of William Warner).  

The word "bound" in the context of being tied or forced is generally associated with the Old Norse word búinn (prepared) and later influenced by the verb "bind". 

The word "bound" is a versatile literary tool that can convey either profound optimism or intense urgency depending on its context, syntax, and whether it acts as a verb, adjective, or noun. It functions by connecting a character to a specific trajectory, destiny, or physical limitation. 

Here is how "bound" conveys these emotions in storytelling:  
Conveying Optimism (Hope and Destiny): When used to express hope, "bound" suggests a positive, inevitable future or a determined, positive action.  
"Bound for [a better place]": This phrase implies a positive trajectory, such as "She was bound for glory" or "They were bound for home." It suggests a hopeful, fated journey.  
"Bound to succeed/win": This implies that success is not just possible, but highly likely, building confidence in the character's journey.  
Optimistic Action: A character who is "bound" by a vow of love or loyalty acts with unwavering positivity, seeing their limitations as a purposeful choice rather than a constraint.