Pushpin

Example:After the meeting, they unpinned all the meeting numbers from the notice board.

Definition:To remove a pin from a surface, which contrasts with the act of pushing a pin in.

Example:The decorator untacked the old wallpaper from the walls before repainting.

Definition:To remove a tack from a surface, similar to unpinning but often used for heavier tacks or nails.

Example:He released the pin that kept the door from opening further.

Definition:To let go of something that is held or held back, which can contrast with the act of pushing in.