The <e1>term</e1> is derived from a boxing <e2>metaphor</e2> - when boxers train on a heavy bag they can knock the bag "off the hook".
The term is derived
The term is derived from a boxing metaphor - when boxers train on a heavy bag they can knock the bag "off the hook".
<triplet> term <subject> metaphor <object> Entity-Origin(e1,e2)