Block

A substantial, often approximately cuboid, piece of any substance.

"a block of ice"

A chopping block; cuboid base for cutting or beheading.

"Anne Boleyn placed her head on the block and awaited her execution."

A group of urban lots of property, several acres in extent, not crossed by public streets.

"I'm going for a walk around the block."

A residential building consisting of flats.

"a block of flats"

To fill (something) so that it is not possible to pass.

"The pipe is blocked."

To prevent (something or someone) from passing.

"You're blocking the road – I can't get through!"

To prevent (something from happening or someone from doing something).

"His plan to take over the business was blocked by the boss."

To impede an opponent.

"He blocked the basketball player's shot."