To decline can mean to become weaker, fewer, or less important over time, or to politely refuse something.
It comes from Latin “declinare,” meaning “to bend down, turn aside,” from “de-” (down) and “clinare” (to lean). The idea of “leaning away” became both physical and social—turning down offers or sinking in strength.
When you decline an invitation, you’re metaphorically “leaning away” from it. The same root shows up in “incline,” which is about leaning toward something—English hides body language inside its vocabulary.
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