The term 'shut off' can be defined by the following crossword solutions: OBSTRUCT (8 letters), CLOSE (5 letters), HINDER (6 letters), RETARD (6 letters), KILL (4 letters), IMPEDE (6 letters), BLOCK (5 letters), SECLUDE (7 letters), END (3 letters), STEM (4 letters), ISOLATE (7 letters), SHUTOUT (7 letters), and stemmed (7 letters). These words all refer to the act of stopping or preventing something from continuing, either by physical means or by hindering its progress. For example, obstructing something would involve blocking it with an object, while closing something would involve shutting it. HINDER and RETARD both refer to slowing down the progress of something, while KILL and END refer to completely stopping it. IMPEDE, BLOCK, SECLUDE, STEM, ISOLATE, SHUTOUT, and stemmed all refer to preventing something from continuing in some way.