cheating or deceiving to favor oneself at gambling or some other activity, such as by making sure the dice roll a certain way, or by rigging a deal of cards / such a cheat or deception

(BDSM) practitioner of erotic bondage

companion

be a fast worker

be available, be not busy

Same as above.

cut corners

(weaponry) a Japanese martial arts truncheon:

(rare, weaponry) a Japanese martial arts truncheon:

clap / (idiomatic) come to an agreement, reach an understanding / (idiomatic) lay the groundwork