go ahead (with something) = start doing something
examples:
- Go ahead and do your work before the baby wakes up.
- We don't have much money right now but we are going ahead with our plans to build a new house.
- Go ahead and eat before your food gets cold.
- If you want to come with us on the trip, just go ahead now.
- Before I go ahead, I have to ask for my mother's permission.
- The government cannot go ahead with its plans, as there is strong opposition from the people.
