cost a packet

to cost a pretty penny

to cost megabucks/a fortune/an arm and a leg

to cost much trouble

to cost one dear

to cost/earn a bomb/a packet

to cost/pay/charge the earth

cost of living

to cost

It cost a mere bagatelle

It cost me an arm and a leg

Cost is based on the [amount of] time involved

cost per dozen

It costs me quite an effort to do it

It costs me a hard struggle.

It costs 25 euros in total.

costs of litigation

It costs more than I had envisaged

costs und benefits

cotton-picking

Cotton is an important raw material.

to cotton on to someone/something

cotton wool

couch potato

to couch in terms