(idiomatic) To feel grumpy and irritable; to be easily annoyed.

(US, idiomatic) An expression of enthusiasm or encouragement.

Correct and apropos; perfectly true. / Alternative form of right-on.

Synonym of get up on the wrong side of the bed

plural of looker-on

(idiomatic) Rapidly or immediately.

Used other than figuratively or idiomatically: see get, it, on. / (slang) To have sex. / (slang) To engage in a fight. / (idiomatic) To hurry up; to get a move on.

(of a patient) Found to be dead upon arriving at hospital. / Found dead at a scene, upon the arrival of an emergency medical service (EMS) or the police. / (slang) Of a new item: received broken.

(idiomatic) To remain idle when action is needed, perhaps because of fear, ignorance, complacency, indecisiveness, or dislike of the person(s) or situation.

(attributive) on call