To carry along in a current or flow, or in physics, when one oscillating system synchronizes with another's rhythm.
From French 'entraîner' (to drag along), from 'en-' (in) + 'trainer' (to pull). Used in physics since the 1800s to describe synchronization phenomena.
Fireflies don't have a conductor, but when hundreds flash together, they entrain each other through light pulses—each insect unconsciously syncs its flash to neighbors, creating mesmerizing waves of light.
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