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Old English gadrian, gædrian "unite, agree, assemble; gather, collect, store up," used of flowers, thoughts, persons; from Proto-Germanic *gadurojan "bring together, unite" (cf. Old English gæd "fellowship, companionship," gædeling "companion;" Middle Low German gadderen; Old Frisian gaderia; Dutch gaderen "to gather," gade "spouse;" German Gatte "husband;" Gothic gadiliggs), from PIE *ghedh- "to unite, join" (see good (adj.). Change of spelling from -d- to -th- is 1500s, reflecting earlier change in pronunciation. Related: Gathered; gathering.