馴れる
なれる · nareru · JLPT N3 · verb-ichidan
to become tame
🐴 馴 = horse 馬 + river 川: a horse that goes with the flow is tame
Sounds the same as 慣れる (nareru, to get used to). 馴れる is the animal version: a horse 馬 that has got used to people and now goes along with them, the way water follows a river 川.