What does "stickpin" mean?

An ornamented pin used to secure a necktie's end flat against the shirt, a tie tack.

What is a synonym for "stickpin"?

Common synonyms include: anklet, armlet, bangle, bead, bead pin, beads.

/ˈstɪkpɪn/ noun

noun ·Uncommon ·Advanced level

Noun

1
An ornamented pin used to secure a necktie's end flat against the shirt, a tie tack. US
"His stickpin was gone and so was his watch-chain."
2
a decorative pin that is worn in a necktie wordnet

"His stickpin was gone and so was his watch-chain."

From stick + pin.