What does the idiom “At the drop of a hat” mean?

The idiom “at the drop of a hat” means acting immediately or without hesitation, often impulsively, as if prompted by a simple signal. Studying this highlights the role of idioms in expressive language, the challenges of understanding figurative meanings, and their impact on fluent communication. For Pakistan, this provides lessons on teaching idiomatic expressions in English curricula, enhancing conversational fluency, and enabling students to use vivid language in professional and social contexts, aligning with global English standards.