Also means
participate
Usage Note
beteiligen is most common as the reflexive sich beteiligen an (+ dative), 'to take part in' something. The related adjective beteiligt means 'involved', and Beteiligung is a 'participation' or financial 'stake'.
Examples
"Viele Bürger beteiligen sich daran."
Natural Translation
Many citizens take part in it.
Literal Translation
Many citizens involve themselves in-it.
Related Words
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