bulls is a form of:

Outwork



noun
1.
(បច្ចេកទេស) កិច្ចការដែលយកទៅធ្វើនៅផ្ទះ, ទីតាំងប្រសើរជាង
ENGLISH MEANING
noun
1.
A minor defense constructed beyond the main body of a work, as a ravelin, lunette, hornwork, etc.
verb
1.
(TRANSITIVE) To exceed in working; to work more or faster than.