can only; obliged to do sth; to have no other choice[cedict]
于
yúㄩˊ
surname Yu[cedict]
in; at; to; from; by; than; out of[cedict]
上
shàngㄕㄤˋ
on; on top; upon; first (of two parts); previous or last (week etc); upper; higher; above; previous; to climb; to go into; above; to go up; to attend (class or university); third tone of putonghua[cedict]
挥洒
huī sǎㄏㄨㄟ ㄙㄚˇ
to sprinkle; to shed (tears, blood etc); fig. free, unconstrained; to write in a free style[cedict]
的
deㄉㄜ˙
díㄉㄧˊ
dìㄉㄧˋ
of; structural particle: used before a noun, linking it to preceding possessive or descriptive attributive[cedict]