B0246200 (bĭl′bō)n.pl.bil·boes An iron bar to which sliding fetters are attached, formerly used to shackle the feet of prisoners.[Origin unknown.]
bil·bo 2
B0246200 (bĭl′bō)n.pl.bil·boesArchaic A sword, especially one having a well-tempered blade.[After Bilbao.]
bilboes
(ˈbɪlbəʊz) pl n (Historical Terms) a long iron bar with two sliding shackles, formerly used to confine the ankles of a prisoner[C16: perhaps changed from Bilbao]