外は寒いよ。コートを着なさい。

outside; exterior; open air; other place

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

cold (e.g. weather); uninteresting (esp. joke); lame; dull; weak; corny

indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!

code; cord; chord

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to wear (in modern Japanese, from the shoulders down); to put on; to bear (guilt, etc.)

to do