The word 'spender' is a transparent English agent noun formed by adding the native Germanic suffix '-er' to the verb 'spend'. The verb 'spend' itself has a more complex journey, entering Old English from Latin expendere, meaning 'to weigh out' or 'pay out'. This Latin term is composed of ex- (out) and pendere (to weigh), reflecting a time when currency was literally weighed to determine its value. Therefore, a 'spender' is etymologically one who 'weighs out' or 'pays out' money, with the modern sense focusing on the act of disbursing funds, often with connotations of the manner or liberality of the expenditure.

Structure: spend (to pay out) + er (agent suffix) spend: From Old English spendan, from Latin expendere (to weigh out, pay out). It functions as the verb root. er: From Old English -ere, an agent noun suffix indicating a person who performs an action.