cap

To impose an upper limit or restriction on an amount or price.

"The government plans to cap energy bills."

An upper limit or restriction placed on an amount or expenditure.

"The council imposed a cap on rent increases."

To cover something with a lid or a protective top.

"Please cap the pen after use."

A soft head covering, often with a peak, worn for warmth or fashion.

"He wore a woolly cap in winter."