背筋 せすじ
sesuji

Noun

1. spine; line of the backbone

それを てうれしくて背筋 せすじがぞくぞくした。
soreo mite ureshikute sesujiga zokuzoku shita.
The sight sent chills of delight up my spine.
Noun

2. seam down the back (of clothing)

Other forms: