The idiom "make a mountain out of a molehill" means to exaggerate or make a big fuss over something that is insignificant or unimportant. It is often used when someone is overreacting to a small issue.

The idiom "two peas in a pod" means that two people or things are very similar or identical to each other. They have the same personality, interests, opinions, etc. The phrase is often used to describe siblings, best friends, or any other pair of individuals who share a close bond.

The idiom "cry over spilt milk" means to regret or lament over something that cannot be changed, usually after a mistake has been made. It can also mean to waste time or effort on something that is fruitless or pointless.

The idiom "a watched pot never boils" means that when you are constantly monitoring or observing something, it seems to take forever to happen or develop.

"Heavy heart" is an idiom that means feeling sad or disappointed about something. It can also mean carrying a heavy burden or responsibility. The phrase can be used to describe a sense of weight and emotional heaviness.