- Bengali Word চাবি, চাবিকাঠিEnglish definition(noun) (1) instrument for shutting or opening a look; a key. (2) instrument for winding a clock or watch by tightening the spring: ঘড়ির চাবি. (3) a lever or button for operating a piano, harmonium, typewriter or other instruments. (4) (figurative) something that can provide an answer to a problem: চাবিকাঠি তার হাতেই আছে, চাবি তালা (noun) lock and key. চাবি দেওয়া (verb intransitive), (verb transitive) lock