timid: wè i x ǐù qiá n

timid means afraid to retreat and dare not move forward.

example: you should not ~ in the face of difficulties, but fight hard and go forward bravely.

The origin of the fear of going back to the front: Song Weitai's Record of the East Xuan: Tang Jie began to play Zhang Yaozuo, and the admonishers were all on the loose, and Wen Yanbo played, then Wu Kui was afraid of going back to the front, which was called dragging the front.

a synonym for timid: flinch? Scared? Quit when you are in trouble? Hold back

the antonym of holding back: volunteer? Non-stop Desperate? Fearless? Go ahead? Step forward? March forward courageously