Biff in a sentence as a noun

For the life of me, I can't phantom how Sun managed to biff this one.

The little icon biff-like that shows if you have new mail?

Biff in a sentence as a verb

It's more like "the little icon biff-like that prevents Thunderbird from taking up space on your alt+tab bar when running".The "is" was just emphasis.

Biff definitions

noun

(boxing) a blow with the fist; "I gave him a clout on his nose"

See also: punch clout poke lick slug

verb

strike, usually with the fist; "The pedestrians pummeled the demonstrators"

See also: pummel pommel