"Arms" are weapons. If you are "up in arms" you are angry enough to go find weapons -- this can be literal or figurative, as in someone who is just really mad.
repetition
Nothing. I believe you mean "start over," which just means to start something again from the beginning and do everything another time, hopefully correctly.
It can mean that you are in a committed relationship with them, as if you belong to each other. It can also mean that you have the advantage over someone, especially if they have done something wrong and you know about it - you could say "I have him now!"
forget em
"Jump the shark" comes from a scene in a 1970s television series, Happy Days, in which someone jumped over a shark. The phrase describes something that has reached its peak, and has turned mediocre.
overused means its used too much or too often
She needs to get over her fear of public speaking in order to advance in her career.
you are exited
This is pretty obvious, isn't it? Butter is easy to spread over bread. This comparison is showing that something else is easy to spread.
The phrase "practice makes perfect" means that by consistently practicing a skill or activity, one can become proficient and improve their performance over time. The more one practices, the better they become at a particular task or skill.
The meaning of the phrase by and by is over time or eventually. It means something will take place sometime on the future but not at a specified time.
This phrase comes from a Milton poem called Comus (1697):Come, knit hands and beat the ground,In a light fantastic roundTo "trip" in this sense doesn't mean to stumble over something. It means to dance lightly and nimbly. This is a very old phrase, now usually used humorously, to mean dancing, especially ballroom dancing.