causative form; to make/let somebody do
The causative form expresses making or letting someone do something.
The causative form means 'to make someone do' or 'to let someone do'. The person who is made or allowed to do the action is marked with に. For example, 母は子供に野菜を食べさせる means 'the mother makes her child eat vegetables'. The subject (the one who makes/lets) is the topic of the sentence, and the person who performs the action is marked with に. This form is common in everyday speech, especially when talking about raising children, giving permission, or describing situations where someone is forced to do something. It is not as formal as some other grammar, but it is standard in both speaking and writing. Be careful: the causative form can also be used to express 'let me do' when asking for permission, as in 行かせてください (please let me go).