| 释义 | 
		underrun I. \| ̷ ̷ ̷ ̷| ̷ ̷\ verb Etymology: under (I) + run transitive verb 1.  : to pass or extend under  < underrun and uplifted by advancing masses of colder air > 2.   a.  : to pass along under in order to examine (a cable)  b.  : to separate and put in order the parts of (a tackle)  c.  : to take in (a net or trawl line) for emptying and resetting  d.  : to lift and empty out (a hose) by walking along and shifting the hold successively along the length intransitive verb  : to flow or persist in a suppressed or underlying stream II. \ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷\ noun 1.  : undercurrent 2.  : a run (as of goods or printed copies) short of the quantity ordered by a customer 3.  : the amount by which the actual cut of merchantable lumber falls below a log scale estimate 4.  : the lower contact surface of a third rail or trolley wire |