ex·tem·po·rize 
(ĭk-stĕmpə-rīz′)
(ĭk-stĕmpə-rīz′)v. ex·tem·po·rized, ex·tem·po·riz·ing, ex·tem·po·riz·es
v.tr.
To do or perform (something) without prior preparation or practice: extemporized an acceptance speech.
v.intr.
To perform an act or utter something in an impromptu manner; improvise: "[When] the house lights dimmed, she could no longer read what she had written and was forced to extemporize" (Dale Peterson).
[From EXTEMPORE.]
ex·tem′po·ri·zation (-pər-ĭ-zāshən) n.
ex·tempo·riz′er n.
- hold one's horses
- hold (one's) own
- hold one's own
- hold one's peace
- hold one's tongue
- hold out
- holdout
- hold out on
- hold out on (someone)
- hold out on someone
- hold over
- holdover
- hold own
- hold peace
- hold (someone's) feet to the fire
- hold someone's feet to the fire
- hold sway
- hold the bag
- hold the fort
- hold the line
- hold the phone
- hold to
- hold tongue
- hold up
- holdup