reckon

establish by calculation.

"his debts were reckoned at £300,000"

be of the opinion.

"he reckons that the army should pull out entirely"

inundate

Flood, overwhelm

e.g
The islands are the first one to be inundated to rising sea level

up-sell

Persuade customer to buy something expensive

e.g
How to upsell without turning-off customer