gregarize
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gregarization — noun The transformation of solitary insects etc. into a swarm or gregaria due to rapid growth in population See Also: gregarize … Wiktionary
gregarise — /grəˈgɛəraɪz/ (say gruh gairruyz) verb (i) (gregarised, gregarising) (of locusts) to move from solitary existence (when they are coloured green) to a group existence (when they are coloured yellow or red), at which point they give off serotonin… …
