three skips of a louse

count to three

Synonym of count to ten.

louse up

To mess up; to confuse; to put into a state of disorder.

me three

Used to express agreement, after someone has already said "me too." Can be continued as "me four," "me five," and so on.

three guys in a garage

A small, agile group of startup innovators with a big idea, passion, and modest resources.

Three Musketeers

A group of three people who are very closely associated; a trio.

three score and ten

Seventy, being the number of years in a full lifetime of traditionally-expected duration.

three sheets to the wind

Unsteady from drink.

three squares

Three square meals, understood as a complete, satisfying, and nourishing regimen of food taken over the course of a day.