HSK 5
系
jì动
to tie; to fasten; to do up (buttons); to knot
上车后请先系好安全带。
Shàng chē hòu qǐng xiān jì hǎo ān quán dài.
Please fasten your seat belt after getting in.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 5.