kǔ​zhàn

arduous effort

苦战 (苦戰) kǔ​zhàn
arduous effort verb
a difficult struggle or persistent effort to achieve a goal, such as in sports or work

After months of hard struggle, the team finally overcame the technical difficulties.

hard battle verb
a fierce and desperate military struggle or physical fight

After a fierce battle, the soldiers finally retook the heights.

Frequency

Movie subtitles
0.420 per million appears in 0% of films
Written text
3.47 per million

Sources

Definitions
CC-CEDICT