let ride

let ride  {v. phr.},  {informal}

To allow to go on without change; accept (a situation or action) for the present.

The committee could not decide what to do about Bob's idea, so they let the matter ride for a month or so.

The class was rather noisy but the teacher let it ride because it was near Christmas.

Ruth's paper was not very good, but the teacher let it ride because she knew Ruth had tried.

Compare: LET GO (3), LET WELL ENOUGH ALONE.