roller

*awkward as a cow on a crutch and *awkward as a cow on roller skates

very clumsy or off balance. (*Also: as ~.) When Lulu was overweight, she was awkward as a cow on a crutch. Tom will never be a gymnast. He's as awkward as a cow on roller skates!

See also: awkward, cow, crutch

high roller

Fig. a gambler who bets heavily. They welcomed me at the casino because I had the same name as one of their high rollers.

See also: high

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a high roller  (American & Australian)

someone who spends a lot of money in a careless way, especially risking money in games He became known as a high roller, and was invited to the biggest gambling tables in town.

See also: high

a roller coaster

a situation which changes suddenly and often between being good and being bad

Usage notes: A roller coaster is a type of small railway in an amusement park which travels very quickly climbing up and down hills.

The Norwegian stockmarket has been on a roller coaster during the past 18 months. What the book does describe very well is the emotional roller-coaster of puberty.