gero

Gero, gerere, gessi, gestum is third conjugation, and the perfect gessi with its doubled s is the part that trips people. The literal sense is to carry, but Latin uses it almost entirely in fixed collocations: bellum gerere, "to wage war"; magistratum gerere, "to hold office"; morem gerere alicui, "to humour someone"; and se gerere, "to conduct oneself".

Two things worth knowing. The perfect participle gesta, used as a neuter plural noun, means "deeds, achievements" - res gestae is the standard title for what a man did, and the Gesta of a bishop or an abbey is a whole medieval genre. And the sense "to wear" clothing is ordinary Latin, not a stretch. English takes gesture, gestation, digest, suggest, register and belligerent from it.