1) Collusion 2) Collusion or partnership 3) Partnership 4) Slang for a partnership 
cahoot is the internet division of Santander UK plc, the British subsidiary of the Santander Group. Cahoot was launched in 2000 as the internet-based banking brand of Abbey National plc, and by 2008 had 750,000 customers. Cahoot is based in Coventry, England. ==History== Cahoot offered interest-free overdrafts and credit cards at launch to its fir...
• (n.) Partnership; as, to go in cahoot with a person.
Ca·hoot' noun [ Perhaps from f. cohorte a company or band.] Partnership; as, to go in cahoot with a person. [ Slang, southwestern U. S.] Bartlett. 
Cahoot is slang for a partnership. Collusion.
noun collusion; `in cahoots with`