meet up; meet up with; meet with; melt down; mock up

meet up
遇見,相見,見面 (與當不及物動詞用的 meet 同義)
You’ll never guess who I met up today - my old classmate! We haven’t met for 20 years. (你絕對猜不到我今天遇見了誰 - 我的老同學!我們已經有 20 年沒見面了)
They met (up) in the park. (他們在公園見面)

meet up with +
遇見,相見,見面 (與當及物動詞用的 meet 同義)
I’ll meet up with you in the library later. (稍後我會在圖書館和你碰面)
I met (up with) her at the theater. (我在戲院遇見了她)

meet with +
(英) 偶然遭遇,意外遇到,碰到 (尤指不愉快的事情,如麻煩、危險、困難等)
I met with some difficulties when I tried to enter the country. (我在入境時遭遇了一些困難)
She met with a car accident yesterday. (她昨天發生了車禍)