Under offer
Definition 1 of 1
Pro Tip 1/3Not Final
The term 'under offer' implies the seller has not yet fully committed to the buyer's offer. Other offers may still be considered. 
Although the flat is under offer, we can submit a higher bid.
Pro Tip 2/3Market Indication
'Under offer' indicates the property is in the process of being sold but can inform buyers of potential interest levels in similar properties. 
Seeing a property under offer can signal it's a desirable area.
Pro Tip 3/3Seller's Position
The phrase can signify the seller's willingness to negotiate, hinting at flexibility or openness to better offers. 
The property's been under offer for a while; the sellers might accept a better deal.