templar

to temper (to moderate or control); to cool down; to warm up; to cool off; to calm down, chill out

“Bajo de este árbol indígena, dos guitarristas de uñas como garras y enruladas melenas templaban sus instrumentos, mortificando cuerdas y clavijas.” — Beneath this indigenous tree, two guitarists with clawlike nails and curly manes tuned their instruments, tormenting string and peg.

Inherited from Old Spanish temprar, tenprar, from Latin temperāre; the -l- in the modern Spanish word was a result of hypercorrection of a popular tendency to use -pr- in place of -pl- in many medieval Ibero-Romance languages (something which persisted in Portuguese, cf. praça, prato). Doublet of temperar, a borrowing.