Senses
一个/ 一個 one
a single person or thing
一个/ 一個 [nature/value indicator]
used before a noun to highlight the category, nature, or value of something, often with a dismissive or emphatic tone
一个/ 一個 the whole
an entire period of time
一个/ 一個 [degree/intensity]
Used before some verbs or adjectives to emphasize a high degree or suddenness of an action.