to visit someone casually and without an appointment
随便拜访某人，无需预约 (suíbiàn bàifǎng mǒurén, wúxū yùyuē)
"We decided to drop in on our cousins while passing through their town."
"我们决定在经过他们的城市时，drop in on 我们的堂兄。" (wǒmen juédìng zài jīngguò tāmen de chéngshì shí, **drop in on** wǒmen de tángxiōng)
to chase someone or something quickly
to calm your body by focusing on slow breaths
to spend time lazily doing nothing
to connect or join with another group or organization
to attend a meeting or class without participating actively
to unite as a group to achieve a shared purpose
