Third-person singular present tense: when something flutters, moves quickly, or darts about restlessly.
From 'flitter' with the -s suffix marking third-person singular present tense (like 'he flitters' or 'the butterfly flitters'). Maintains the Old Norse root meaning quick, restless movement.
Notice how 'flitters' sounds different from 'flutters'—the harder 't' sounds make it feel sharper and more erratic, which is exactly what's happening when something flitters versus the rounder sound of fluttering!
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