godan verb (-su), intransitive verb
go out of turn; send ahead
Used when someone acts or sends something before the proper order or ahead of others. Often implies a breach of etiquette or protocol.
順番を待たずに差し越すのは失礼だ。
It's rude to go out of turn without waiting for your turn.
彼は先輩を差し越し
He spoke ahead of his seniors, going out of turn.