させる details
Examples
make someone do — the subject imposes the action through authority or instruction
監督は選手たちを毎朝走らせる。
kantoku wa senshutachi o maiasa hashiraseru.
The coach makes the players run every morning. neutral
お待たせして申し訳ございません。
o matase shite moushiwake gozaimasen.
I am terribly sorry to have kept you waiting. formal
let someone do — the subject permits, or simply doesn't stop, someone acting as they wish
好きなだけ寝させてあげなよ。
suki na dake nesasete agena yo.
Just let him sleep as much as he wants. casual
父は私に進路を自由に決めさせてくれた。
chichi wa watashi ni shinro o jiyuu ni kimesasete kureta.
My father let me decide my own path freely. neutral
Formation
G1 あ段+せる(行く→行かせる)/G2 させる(食べる→食べさせる)/する→させる/来る→こさせるattaches to verb stem (class-specific)
Notes
Related patterns
Similar
Permission from two seats — permissive させる grants the act from the granter's side, てもらう receives a favor from the receiver's side; させてもらう composes them into "get to do".
Lookalikes
The same chain of coercion told from opposite ends — the causative seats the one applying pressure as subject (先生が生徒に書かせた), its passive させられる seats the one compelled and adds their reluctance (生徒は書かせられた); pick by whose side of the coercion the sentence tells.