sale

sale /ˈseɪl/ noun
plural sales
sale
/ˈseɪl/
noun
plural sales
Britannica Dictionary definition of SALE
1 
a  [count] : the act of selling something : the exchange of goods, services, or property for money
b  sales [plural] : the total amount of money that a business receives from selling goods or services
2 
[count] : an event or occasion during which a business sells goods or services at prices that are lower than usual
— see also clearance sale
3 
sales [plural] : the business or activity of selling goods or services
— often used before another noun
4 
[count] : a public event at which things are sold
— see also garage sale, rummage sale, tag sale, yard sale

for sale

: available to be bought

on sale

1 
: available to be bought
2 
chiefly US : selling at a price that is lower than usual

on sale or return

British, business
: with the agreement that products which are not sold will be taken back without having to be paid for