One who opposes a specific ship or shipping in general.
One who objects to ships or shipping deemed offensive, e.g. due to incest, age differences, abusive elements, or power gaps (treating the other partner badly because they have less authority).
One who blocks or impedes the movement of an opponent.
A gatekeeper who refuses the marketer access to the person they wish to contact.
A bug or issue that prevents software from being released.
A person who blocks (stretches or moulds) hats.
A blocker bet.
Any of various medications that block (inhibit) the activity of a chemical messenger or its receptors, such as cardiac conduction modifiers (e.g., alpha-blockers), gastric acid inhibitors (H₂ histamine blockers), puberty blockers, and others.
A close-fitting rectangular glove worn by a goalie in multiple forms of hockey.
One who prevents another user from contacting them electronically.
An application that stops / impedes unauthorised access to a programme.
A playing card, needed by one player, that is held by another.