From steven (“part of a ship's deck”) + -en. <span class="searchmatch">stevenen</span> to steeve, to project upward to bear down...
From be- + <span class="searchmatch">stevenen</span>. IPA(key): /bəˈsteː.və.nə(n)/ Hyphenation: be‧ste‧ve‧nen bestevenen (transitive, nautical) to turn one's bow to (transitive) to sail...