IdiomDaily LifeEnglish

in full swing

Meaning: At the peak of activity or intensity.

Example: “By nine o'clock, the festival was in full swing.”

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Origin: Documented from the mid-1800s, and most plausibly grounded in the literal image of a swinging pendulum, rope, or dancer's body reaching its point of greatest momentum and force — "full swing" as the peak of a motion's natural arc, not yet slowing down. A related, earlier sense of "swing" for the general course or run of a career or period of activity dates back to the 1500s, which may have fed into the modern phrase as well. Either way, "in full swing" settled into describing anything — a party, a project, a season — that has moved well past its tentative beginning and reached its peak level of activity.

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