to become defiant; to fight back; to turn upon; to take the offensive

rise of the curtain; opening of a play

to vacate; to surrender (e.g. a castle); to give up (e.g. a position); to hand over (e.g. power)

development; exploitation (of resources)

holding (a conference, exhibition, etc.); opening; hosting (e.g. the Olympics)

opening to the public; making available to the public; exhibiting; unveiling; release (of a film, information, etc.); disclosure; publication

start; commencement; beginning; initiation

development (of a three-dimensional shape)

opening (a door, window, etc.); leaving open

reopening; resumption; restarting

raising the curtain

opening of a meeting