ph.
1. 翻土掺进;把…混入（土里）
If you dig a substance in, or dig it into the soil, you mix it into the soil by digging.
2. (士兵)挖掩体隐蔽，掘壕防守
When soldiers dig in or dig themselves in, they dig trenches and prepare themselves for an attack by the enemy.
3. （面临失败、困境等时）固执己见，坚定立场，坚持不懈
If you say that someone is digging in, you mean that they are not changing their mind or weakening their efforts, although they may be losing a contest or facing difficult problems.
4. 开始大吃;开始尽情吃
If someone digs in, or digs into some food, they start eating eagerly. If you tell someone to dig in, you are inviting them to start eating, and encouraging them to eat as much as they want.