(every) once in a while• But look at them once in a while.• I do need to see every once in a while.• I used to take him out fishingonce in a while.• They were both lonely, so why not see each other once in a while.• He just comes round once in a while and they go out.• I only see her every once in a while at school.• All of these Helen used, displayed, wore, not once in a while, but every day, blushing.• He calls me once in a while or I call him.• I think you should change your shampoo and conditioneronce in a while to avoidproductbuild-up.