German

Gleich und Gleich gesellt sich gern

proverb[ˈɡlaɪ̯ç ʊnt ˈɡlaɪ̯ç ɡəˈzɛlt zɪç ˈɡɛʁn]

birds of a feather flock together

Gleich und Gleich gesellt sich gern is a German proverb meaning “birds of a feather flock together”.

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Meanings and forms from Wiktionary (CC BY-SA 4.0); example sentences from Tatoeba (CC BY 2.0 FR).