突 = to dash or move forward quickly; abruptly; suddenly; unexpectedly, protrude
It's all about things moving forward and unexpectedly with this one!
Random words that come to mind include unexpectedly or out of the blue 突然 (tūrán), as well as conflict 冲突 (chōngtū) or 突出 (tūchū), something that is prominent or that sticks out.
突发 (tū fā) is interesting as well — it means to break out or appear unexpectedly... like 疾病突发 (jí bìng tū fā), the outbreak of an illness.
It's also a cute onomatopeia for things that have a tapping sound or that chug along, like when your heart goes pit-a-pat (你的心突突地跳, nǐde xīn tūtū de tiào).











