1. (US Und.) one who cheats his partner(s) in crime by embezzling the takings of a scam.
|Vocabulum 80: […] sinkers Thieves who do not divide fair with their companions.|
2. a drunkard [later use Aus.].
|Dict. of Aus. Words And Terms [Internet] SINKER — A drunkard.|
|Und. Speaks n.p.: Sinker, a drunkard.|
3. (S.Afr.) a judge.
|Crime in S. Afr. 106: A ‘sinker’, a ‘sticker’ or a ‘stretcher’ is a judge.|