“伸手”常见的英文表达有 reach out (one's hand) 或 stretch out (one's hand)，具体使用哪个可根据语境和表达习惯来选择：
reach out (one's hand)：强调主动伸出手去够、触摸或与他人互动，带有一定的主动性和意图性。例如：
He reached out his hand to shake mine.（他伸出手来和我握手。）
She reached out her hand to catch the falling book.（她伸出手去接那本掉落的书。）
stretch out (one's hand)：更侧重于描述肢体动作，即把手伸展开来，相对更单纯地描述动作本身。例如：
He stretched out his hand to turn off the light.（他伸出手去关灯。）
The child stretched out her hand to pick the flower.（孩子伸出手去摘那朵花。）