Boycott clause. A charterer may insist that a charterparty contains a clause, which causes the shipowner to take the risks if the vessel is delayed by a "boycott" by labour.
Broker. In the context of chartering, the most common "broker" is a "shipbroker". In general, in shipping, a broker is a person who acts as a "middleman" between two parties and negotiates the terms of a contract into which the two parties enter. The broker acts as an agent and usually represents only one of the parties, negotiating with the other party directly or with another broker representing the other side. In addition to a shipbrokerwho can be an owner's broker or a charterer's agent negotiating a charter.
Breakdown clause. Time charterparties contain a clause providing that if the ship is unavailable for the charterer's use because there is loss of time as a result of "...breakdown or damages to hull, machinery or equipment..." (among other causes) payment of the hire money to the shipowner ceases for all or some of the time lost.
Black list. Because oil tankers frequently load oil from Islamic countries these countries may place certain ports on a "black list" such as Israeli or South African ports, and if tankers are known to have called at ports in those countries, the tankers' names are on this black list and the ship can be boycotted and refused entry or cargo.