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cash (n.)

1590s, "money box;" also "money in hand, coin," from French caisse "money box" (16c.), from Provençal caissa or Italian cassa, from Latin capsa "box" (see case (n.2)); originally the money box, but by 18c. the secondary sense of the money in it became sole meaning.

Like many financial terms in English (bankrupt, etc.), it has an Italian heritage. Not related to (but influencing the form of) the colonial British cash "Indian monetary system, Chinese coin, etc.," which is from Tamil kasu, Sanskrit karsha, Sinhalese kasi.

Cash-crop "agricultural product grown to sell for profit" is attested from 1831; cash-flow from 1954; the mechanical cash-register "machine for automatically recording the sums of money deposited in it" is from 1878. 

cash (v.)

"convert (a check, etc.) to cash," 1811, from cash (n.). Encash (1865) also was sometimes used. Related: Cashed; cashing.

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Definitions of cash from WordNet
1
cash (n.)
money in the form of bills or coins;
there is a desperate shortage of hard cash
Synonyms: hard cash / hard currency
cash (n.)
prompt payment for goods or services in currency or by check;
Synonyms: immediate payment
2
cash (v.)
exchange for cash;
I cashed the check as soon as it arrived in the mail
Synonyms: cash in
3
Cash (n.)
United States country music singer and songwriter (1932-2003);
Synonyms: Johnny Cash / John Cash
From wordnet.princeton.edu