set on
[verb]
Synonyms: incite, abet, foment, instigate, provoke, raise, set, stir (up), whip (up)

[TahlilGaran] English Synonym Dictionary ▲

set on somebody phrasal verb British English (see also set)

1. set somebody/something on somebody to make people or animals attack someone:
The farmer threatened to set his dogs on us.

2. [usually passive] if you are set on by people or animals, you are suddenly attacked by them:
A thirty-five-year-old man was set on by four youths last night.

3. set somebody on/onto somebody to give someone information about a person who you think has done something wrong, because you want that person to be found and caught:
If I refuse, he’ll set the police onto me.

[TahlilGaran] Dictionary of Contemporary English ▲

set on
v.
1. To begin suddenly to fight against; attack fiercely.
Tom was walking through the park when a gang of boys set on him.
2. To cause to attack.
Some boys went to steal melons but the farmer set his dog on them.

[TahlilGaran] English Idioms Dictionary ▲