set in

phr

• ① (坏天气、冬天等)开始
  • The bad weather has set in.坏天气开始了。

• ②[以it为主词]开始…
  • It was setting in to snow.开始下起雪来。

• ③ (疾病、流行等)来到

• ④ (潮水等)流动,向…前进