Bed-blocking is often thought to occur due to a lack of care home places for the elderly.

BBC: Gloucestershire hospitals failing over 'bed-blocking'

They thought that by blocking these receptors with druglike chemicals they might shut down the signals for tumor growth.

FORBES: Targeting Tumors

These are compounds of oxygen, sulphur, selenium and tellurium that are thought to be particularly suitable for thermoelectric applications because their structure allows electric currents to flow while blocking thermal currents.

ECONOMIST: Thermoelectrics