noun
betting ticket; betting slip
Specifically a horse-racing betting ticket; synonymous with 馬券.
See also: 馬券
勝馬投票券を買って、レースを観戦した。
I bought a betting ticket and watched the race.
Common abbreviation for 勝馬投票券; used in the same horse-racing context but more colloquial.
Compound of 勝馬 (winning horse) + 投票券 (voting ticket). The exact historical derivation is uncertain, but the term is conventionally associated with horse-race betting.