拉紧

lā jǐn de tí qín xián

拉紧的提琴弦

taut violin strings

ràng shéng zi sōng zhe zhí dào wǒ jiào nǐ lā jǐn

让绳子松着，直到我叫你拉紧。

Keep the rope slack until I tell you to pull it.