Question

how did Gandhi ji propose to turn non-cooperation into a movement

Answer 1

Gandhi ji meant that

Start would be made with the boycott of foreign goods

Surrendering of titles

and finally if govt used repressive measures then the movement would be turned into a full civil disobedience movement.

Answer 2

Noncooperation movement, unsuccessful attempt in 1920–22, organized by Mohandas (Mahatma) Gandhi, to induce the British government of India to grant self-government, or swaraj, to India. It was one of Gandhi's first organized acts of large-scale civil disobedience (satyagraha).