noun
selling; foisting; pushing a sale
Often implies aggressive or unwanted selling, such as pushing a product onto someone or forcing a sale.
訪問販売の売り付けがひどくて困った。
The aggressive door-to-door selling was so bad it was a problem.
不良品の売り付けは詐欺にあたる。
Foisting defective goods on customers amounts to fraud.
押し売り is more explicitly about high-pressure or pushy selling, while 売り付け can be used for any kind of selling with a nuance of imposition.
Compound of 売り (uri, 'selling', the continuative form of 売る) and 付け (tsuke, 'attaching', from 付ける). The combination suggests 'attaching a sale' to someone, i.e., pushing a sale onto them.