substitute a person or thing for (another that is broken or inefficient or lost or no longer working or yielding what is expected)

reciprocal transfer of equivalent sums of money (especially the currencies of different countries)

one whose business is to exchange the money of one country for that of another country

convert into direct current

convert (from an investment trust to a unit trust)

convert (a company's reserve funds) into capital

convert illegally obtained funds into legal ones

exchange for smaller units of money

lay aside, abandon, or leave for another