Spin (one's) wheels verb phrase
If someone spins their wheels, they are trying hard to do something but do not achieve the desired result.
We need marketing execution but without a strategy, we’ll just spin our wheels.
I felt like I just spun my wheels trying to explain the answer for him.
The verb "spin" should be conjugated according to its tense.
This idiom, with its image of a vehicle in snow or sand that spins its wheels but cannot move, dates from the mid-1900s.
A humorous way of saying that what one has said is just what they acknowledge and may not be entirely accurate
Mike: Have you returned from your vacation on the beach? Your skin seems to get tanned.
Jenny: My skin is always dark. That's my story and I'm sticking to it!