Dictionary

To cause to fail; to frustrate, to prevent.

Example: Our plans for a picnic were thwarted by the thunderstorm.

To place (something) across (another thing); to position crosswise.

To hinder or obstruct by placing (something) in the way of; to block, to impede, to oppose.

To move (something) across or counter to; to cross.

Example: An arrow thwarts the air.

An instance of blocking or obstructing.