becoming accustomed to a task, situation, or flavor through repeated exposure or practice

刚开始做这项工作难免有些手生，但一次生，两次熟，多练练就习惯了。

the transition from being strangers to friends or acquaintances through repeated meetings

别害羞，大家一次生，两次熟，多见几次面就成了好朋友。