last nail of the coffin とどめを指す

Boris についてのon

prolong のばす　lengthen

intertwined with 絡み合っている

inextricably　解きほぐせない

Food is inextricably intertwined with national identity for countries in continental Europe

Row over 口論

Grapple with 取り組む

grapple = wrestle

swagger 闊歩　strut

a very confident and arrogant or self-important gait or manner. いけてる人（とうぬぼれてる人？）