sobreactuar - to overact

socializar - to socialize

solidificar - to solidify

solicitar - to request

soltar - to loosen

solucionar - to solve

sondar - to probe

sondear - to sound, to probe, to sound out

sintonizar - to tune in, to syntonize

sitiar - to besiege

sobregirar - to overdraw

sobreponer - to superimpose

sobresalir - to stand out, to excel