to lose one's head: not to think clearly, to lose one's self-control
to keep one's head: to remain calm during an emergency
to put (someone) on: to mislead by joking or tricking (S)
This idiom is usually used in a continuous tense form. A noun object must divide the idiom.
to take in: to visit in order to enjoy (S); to decrease the size of clothes (S); to deceive, to fool (S)
to stir up: to cause anger or strong emotion (S); to create (trouble or difficulty) (S)
to look out on: to face, to overlook
The noun form lookout derives from this idiom.