Cave In and Loaded For Bear.

Today's phrasal verb is Cave in, which has two meanings:
1- To collapse

The roof caved in because of the weight of the snow.

2-Stop resisting or refusing

The government has refused to cave in despite the protests and demonstrations.
He caved in to the urge to have a cigarette 

Notes: Intransitive and inseparable in both instances of the definition.  It is common to hear this phrase followed by the word, pressure. E.g., "cave into pressure".

Today's idiom is one of my favorites, Loaded For Bear, which means

To be prepared, mentally and/or physically, for extreme opposition; typically used in reference to an aggressive or potentially violent situation. To be aggressively seeking a confrontation; prepared for any contingency.

When the police responded to the reports of a men in body armor with AK-47s robbing a bank, they came loaded for bear.

I have 3 pages of notes to assist me with this presentation.  I'm loaded for bear. 

I bought a case a beer and order 5 pizzas for tonight's party.  We're loaded for bear.  

P-48 Thunderbolt loaded for bear over France

This idiom can sometimes mean to carry more equipment than necessary. To be overloaded. It can be used in a variety of ways meaning a person is equipped more than necessary for his/her prey.

	A woman "dresses up" with high heels, lipstick, new hair-do, perfume, etc. for club-hopping. "She's loaded for bear." A youth is going hunting for squirrel but takes his father's high-powered rifle and a shotgun. He's loaded for bear.

The phrase originates with American hunters and woodsmen in regions frequented by the brown bear. Brown bears are the largest land-based predator on earth, and when expecting to deal with them the hunters would bring much more powerful rifles than they would if hunting other game. Further, old muskets were loaded by pouring gunpowder down the barrel, followed by the shot. The power of a given charge could be adjusted by adding more or less gunpowder. When hunting large animals like bear, a large and powerful gunpowder charge would be loaded into the musket. Hence loaded for bear is to be hunting with a powerful charge ready.