Question

all comers,all-comers

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ˌall<ʃoŋð style="font-weight:normal">'comers,all-comers
◙noun [pl.]
1. everyone who wants to take part in something, especially a competition
• 所有参与者，所有参赛者:
 »The marathon is open to all comers.
  马拉松比赛谁都可以报名参加。