toss something off
phrasal verb with toss verb uk/tɒs/ us/tɑːs/
informal
（尤指粗枝大叶或轻而易举地）快速做
to do something quickly, especially in a careless way or with little effort
She tossed off a reply to the letter before she left for the meeting. 她去开会之前草草回了这封信。