1802, in military writing, for a very tight style of mass marching, from lock (n.) + step (n.).
Lock-step. A mode of marching by a body of men going one after another as closely as possible, in which the leg of each moves at the same time with and closely follows the corresponding leg of the person directly before him. [Thomas Wilhelm, "Military Dictionary and Gazetteer," Philadelphia, 1881]
Figurative use by 1836.
双语例句
1. She shrugged a stray lock of hair out of her eyes.
她把一缕散发从眼前甩开。
来自柯林斯例句
2. He picked each lock deftly, and rifled the papers within each drawer.
他熟练地撬开每一把锁，把每个抽屉里的文件都偷走了。
来自柯林斯例句
3. That key will come in handy if you lock yourself out.
要是你把自己锁在了屋外，那把钥匙就派上用场了。
来自柯林斯例句
4. She eventually had to lock herself in the toilets to avoid him.
她最后只好把自己锁在厕所里来躲开他。
来自柯林斯例句
5. It was too late now for Blake to lock his room door.
