Definition
to secure and maintain an advantage, for instance, a favorable price
确保可以保有的优势（如低价）
She quickly signed the contract to lock in the low price.
她迅速签署合约以锁定低价。
This hotel offers a deal where you can lock in the room rate by booking in advance.
这家酒店提供一项优惠，您可以通过提前预订来锁定房价。
In this deal, we successfully locked in favorable terms.
在这笔交易中，我们成功锁定了有利的条款。