fix
The word carries a strong sense of restoration and stability. When used as a verb, it suggests a transition from a state of disorder or breakage to a state of functionality. It is the standard, versatile term for repair, ranging from mechanical tools to interpersonal relationships.
Countable when referring to a specific solution or a predicament (a quick fix, a tight fix). Uncountable when referring to the act of repairing in a general sense.
Meanings
To repair something that is broken or malfunctioning.
"He needs to fix the leaky faucet."
To arrange or settle a time, price, or date.
"They decided to fix a date for the wedding."
To make something firm or stable in a specific position.
"The carpenter will fix the shelf to the wall."
To become stable or stationary.
"The gaze of the predator began to fix on the prey."