1)Cold Shoulder
-David gave his girlfriend the cold shoulder after they broke up.
-Jessica's parents are so busy it feels like they are giving her the cold shoulder.
-James wanted to talk to Jane at school but she gave him the cold shoulder.
Meaning: A form of body language what occurs when a person is ignoring you completely. It is usually an action represented by turning your black/shoulder towards the target and not communicating to them even though the subject is obviously attempting to talk to you.
Etymology: Although the exact origin is disputed, the first occurrence of the phrase "cold shoulder" appearing in print is in the Scots language, from The Antiquary by Sir Walter Scott in 1816
2)Hot Hand
-James had the hot hand so his team won the basketball game.
-Cherry at the hot hand in poker last night.
-My friends came to my place to play video games last night but no one could beat me because I had the hot hand.
Meaning: The notion that because one has had a string of successes, he or she is more likely to have continued success
Etymology: Mid 19th century; earliest use found in Merry's Museum. From hot + hand.
3)Warm up to
-Jessica did not get on well with her new colleagues at first, but after some time she warmed up to them.
-Tim was warming up to the idea of changing to the night shift at work.
-I warmed up to the marvel movie franchise after I saw the Avengers.
Meaning: to become more responsive and receptive to someone, a group, or something.
Etymology: stems from previous terms such as the cold shoulder and a warm reception. There is a general association between warmth and a good reception - "the film was met with a warm reception".