baisser

To lower something specific (baisser le son, baisser la tête), and, intransitively, for a value or level to drop on its own (les prix baissent, la température baisse). Figuratively, baisser les bras means to give up.

• Le gouvernement a baissé les impôts cette année. — The government lowered taxes this year.
• Les températures baissent en automne. — Temperatures drop in autumn.
• Ne baisse jamais les bras face aux difficultés. — Never give up in the face of difficulties.

Baisser is transitive when you lower something specific but plainly intransitive when a value drops on its own (les prix baissent) — English speakers sometimes add an unneeded reflexive pronoun where French just uses the plain verb.