Fire in a hole is an idiom. Since World War II and Vietnam War, when the US military throws grenades into the cave, it will first shout fire in the cave to remind people around it that it will explode soon.

Lexical analysis:

1, fire

English pronunciation: [? Far]

English explanation: n. fire; Fire; Fire; Fire; kitchen

Example:

After soaking the pot in this mixture, it is fired.

Pottery pots are immersed in this mixture and then fired.

2. Hole

English pronunciation: [hl]

Chinese interpretation: n. hole hole; Pit; Cracks; Opening; Eye hole; Caves; nesting

Example:

There are some loopholes and unanswered questions in that theory.

There are some loopholes in that theory and some questions have not been answered.

Extended data

Usage of fire:

1, fire is an uncountable noun when it is used as a material noun to mean "fire". Generally, it has no article and cannot be used in the plural form. Fire is a countable noun when referring to specific fire, fire and fire.

2. When expressing the abstract event of "fire", fire is an uncountable noun. The extension of fire can mean "shooting", "artillery fire" and "firepower", which is an uncountable noun.

3.fire is used as a metaphor, meaning "enthusiasm", "anger" and "enthusiasm", which is usually uncountable and occasionally used in the plural to express various strong feelings.

When fire is used as a noun, it means "fire", and when it is converted into a verb, it means "burning", "light", "fire" and "shooting". Extension can mean "excited", "angry" and "launched".