change (small denominations of money given in exchange for a larger denomination) / exchange; switch (act of exchanging or switching two thing) / a small amount of money / payback (act of revenge)

first-person singular present indicative of trocar

(intransitive, euphemistic) to pay back (to enact revenge)

apropos of nothing (without any apparent reason or purpose)

for what reason?

third-person singular preterite indicative of trocar

plural of troco

small amount of money