(Britain, slang) To commit suicide.

(US) To fill or refill the final portion of something that is not empty, until it is completely full. / To complete, to put the finishing touch to (something).

An item of casual clothing: a top with no sleeves. / The top of a ship's bilge tank, usually the lowest horizontal surface on board.

A secret that is classed as "top secret"; a top-secret secret; top-secret information. / Used other than figuratively or idiomatically: see top, secret.

(military, government) Information classified at one of the highest levels of sensitivity by a government, based on an assessment that it would cause exceptionally grave damage to national security if disclosed.

Of or relating to a hierarchical system that progresses from a single, large basic unit to multiple, smaller subunits. / Produced, controlled, or directed by those at the top of the hierarchy.

the typescript of a document that has carbon copies underneath

The highest gear that is available in a motor vehicle or car.

Channel Island milk.

having a high centre of gravity, and liable to topple / (of an organization) having an excessive number of administrators or managers