noun / verb
cost
KAWST/kɔːst/
The resources required to obtain or accomplish something.
The loaf of bread costs the shopper five coins.

Etymology
“With” and “stand” formed a Latin verb that could mean “stand at” a price. The same image survives when we say a price “stands at” a certain amount: that amount is the cost.
In context
So the estimate is the calculation of the cost to do the work.
More examples
- The cost of repairs exceeds our budget.
- Constant travel takes a toll, but she accepts that cost.
- The mistake cost him a day's work.
- We costed the project before approving the budget.
Forms
cost · costs · costed · costing
costly adjective — Requiring a large expense or sacrifice.