What does Lo Siento Mucho mean?

Example:

Lo siento mucho means “I’m very sorry.” Picture someone bowing LOW, full of heartfelt SENTiment and MUCH regret: LOW + SENTiment + MUCH gives you a playful memory hook for lo siento mucho. Literally, it’s “I feel it a lot”—an apology with its hand on its heart, not a casual “Oops!”