From Longman Business Dictionary
nudgenudge /nʌdʒ/ verb [intransitiveI, transitiveT] to increase the value or position of something on a scale by a small amount, or to increase or move up by a small amountnudge something up/to something etcInvestors bought blue chips again, nudging the Dow Jones Industrial Average to another all-time high.
nudge upHonda increased its share of the car market even though its sales nudged up only slightly.
—nudge noun [countableC usually singular]The interest rate cuts will give the economy an upward nudge.