mourning
n [U] black or dark clothes worn as a (conventional) sign of grief at sb's death 丧服(黑色或深色的)
When grandmother died they went into (ie started to wear) mourning. 祖母逝世时他们开始服丧.
She was in mourning for a month. 她服丧一个月.
If an unfair law existed, - and there were many that had been passed by the British rulers in India and South Africa - it was the duty of everyone to disobey this law, but without using violence.