group stage
US /ˈɡruːp steɪdʒ/
UK /ˈɡruːp steɪdʒ/

1.
a phase in a tournament where teams or competitors are divided into groups and play against each other, with the top performers advancing to the next round
:
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Our team successfully advanced from the group stage to the quarterfinals.
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The draw for the group stage will be held next month.