1.hold back:"隐瞒；退缩；抑制；阻止"
2.cut off :"切断；中断".意思都差不多啊有差别，请看例句：1. Though he was very sad,he managed to hold back his tears. 虽然他很伤心，但还是设法抑制住自己的泪水。2. They managedto cut off the enemy's food supplies. 他们设法切断了敌人的食品供给。祝您进步。