1) Being a pill
-Tom Petty was being a pill for insisting that another artist song sounded like his
-Damien was being a pill for always bullying the little brother he was jealous of
-Emma was being a pill for always sulking at family reunions.
Definition: Being a "pill" is being a pain, like a cranky child or a boring guest.
Etymology: Many people dislike or have trouble taking pills, so to call a person a pill means that he or she is hard to take or hard to deal with.
2) Thrown under a bus
-During the football scandal, which involved deflated footballs, NFL coach threw his star player Tom Brady under a bus to save himself
-Many people thought Microsoft threw their users under the bus when they introduced the complicated Microsoft Phone 8
-The Mayoral candidate threw his campaign manager under a bus after the manager was found to have had an extramarital affair
Definition: to sacrifice a friend or ally for selfish reasons. It is typically used to describe a self-defensive disavowal and severance of a previously-friendly relationship when the relation becomes controversial or unpopular.
Etymology: A journalist wrote "In the rock 'n' roll business, you are either on the bus or under it. Playing 'Feelings' with Eddie and the Condos in a buffet bar in Butte is under the bus."
3) On edge
-The presidential candidate was on edge after he found out his wife was rushed to the hospital midway through his speech
-Mark the pilot was on edge after a strange light appeared on his plane
-Abigail was on edge when her uncle claimed her house was haunted
Definition: nervous
Etymology: As if one were balanced as in {2}. See also on the edge