再開(さいかい)

再開(さいかい) means to resume or restart something that was interrupted or stopped. It applies to activities, operations, services, and events — not to machines or devices (use 再起動(さいきどう) for those).

COMMON PATTERNS:

• 再開(さいかい)する: to resume, to reopen
• 再開(さいかい)を決(き)める: to decide to resume
• 再開(さいかい)を求(もと)める: to demand resumption
• 再開(さいかい)される: to be resumed (passive)
• 〜の再開(さいかい): resumption of ~

TYPICAL CONTEXTS:

• 営業(えいぎょう)を再開(さいかい)する: to resume business
• 交渉(こうしょう)の再開(さいかい): resumption of negotiations
• 試合(しあい)が再開(さいかい)される: the game is resumed
• サービスを再開(さいかい)する: to restart a service

HOMOPHONE:
再会(さいかい) (reunion — meeting someone again) uses different kanji and has a completely different meaning. Be careful not to confuse them.