IPA: /ˈkɒstɪŋ/
KK: /ˈkɔstɪŋ/
The estimation of how much money is needed for a process or product.
The costing of the new project was higher than expected.
To require a certain amount of money to be paid for something.
The new car is costing me a lot of money each month.
Past: cost
Past Participle: cost
Costing → It is formed from "cost" (from Old French *coste*, meaning expense or price) and "-ing" (a suffix used to form nouns indicating an action or process). The word "costing" refers to the process of determining the expense or price of something.
Think of the word 'cost' which relates to expense, and remember that 'costing' is the process of figuring out that expense.