All 7 meanings

1. (transitive) to set, to place, ready (an implement or tool in the required position for its usage, implying an intent to start using it, e.g. a chisel on stone, a pen on paper, a bottle on the lips)
2. (transitive) to schedule, to set (a meeting, a procedure, an election) [with für (+ accusative) ‘for a certain time’]
3. (transitive) to prepare (a concoction or mixture, such as to start a process that results in the intended product, e.g. fermentation or acquiring a certain aroma)
4. (transitive) to develop, to start forming (seeds, rust, a patina, etc.)
5. (transitive) to set someone on something or someone, to set someone to some task (e.g. tracking dogs on a person, detectives or lawyers on a case, workers on a problem) [with auf (+ accusative) ‘on something/someone’]
6. (intransitive) to begin, to attempt (an act, especially movement, either being interrupted or not yet having had the chance to fully perform it) [with zu (+ dative) ‘something’]