2.be/get in on the ground floorTAKE PART/BE INVOLVEDto become involved in a plan, businessactivity etc from the beginning 从一开始便参加〔某计划、商务活动等〕
Examples from the Corpus
ground floor• In the same week, they also got into his ground floorflat twice and stole his cheque book and card.• Get in on the ground floor.• Accommodation for residents is on the ground floor or well-serviced by lifts.• Suppose you lived at the top of the building, and your parentsstayed on the ground floor.• The bookshop was on the ground floor, and the gallery in the basement.• She guided him back to the lift, down to the ground floor and the street and into a taxi.• Under the vaultedground floor was a guardroom and small prison.