Definition
Used to express strong agreement with a previous statement.
当然！
"This restaurant's food is delicious, isn't it?" "I'll say!"
「这家餐厅的食物很美味，对吧？」「我同意！」
"Do you think this movie is great?" "I'll say!"
「你觉得这部电影很棒吗？」「我同意！」
"That was definitely a tough decision." "I'll say!"
「那绝对是个艰难的决定。」「我同意！」