noun
Originally a military term for the rear unit or rearguard. Now also used figuratively for the last person or thing in a sequence.
彼は行列のしんがりを務めた。
He served as the rear guard of the procession.
マラソンでしんがりを走る。
I run at the very back in the marathon.
noun
anchor; last person
Used in sports or group activities for the person who goes last, such as the anchor leg in a relay or the final performer.
リレーのしんがりはチームで一番速い選手だ。
The anchor of the relay is the fastest runner on the team.
最後尾 is a straightforward word for the very end of a line or queue, without the military or anchor connotations of しんがり.
The reading しんがり is a compound of しん (rear) and がり (guard). The kanji 殿 is used for its meaning of 'rear' or 'back' in this context.