I. rung 1 /rʌŋ/ BrE AmE
the past participle of ↑ ring 2
II. rung 2 BrE AmE noun [countable]
[ Language: Old English ; Origin: hrung ]
1 . one of the bars that form the steps of a ladder
2 . informal a particular level or position in an organization or system
rung of/on
Humans are on the highest rung of the evolutionary ladder.