cotizar - to quote prices, to prorate, to distribute proportionally
cristianizar - to christianize
crujir - to creak, to grate, to crunch
cuchichear - to whisper, to gossip
currar - to work
cursar - to study, to send, to process
colarse, (ue) - to slip
convertirse - (ie), to change
chirriar - creak
cartearse - correspond
conmutar - commute
conturbar - disquiet, harass, unsettle
correlacionar - correlate