Seconding

To agree as a second person to (a proposal), usually to reach a necessary quorum of two. (See under #Etymology 3 for translations.)

"I second the motion."

To follow in the next place; to succeed.

To climb after a lead climber.

To transfer temporarily to alternative employment.

"The army officer was seconded while he held civil office."

To assist or support; to back.

To agree as a second person to (a proposal), usually to reach a necessary quorum of two. (This may come from the English adjective above.)

"I second the motion."

To accompany by singing as the second performer.