D defs.my
Entry 4 senses · 2 variants Webster, 1913

Improvise

/ĭm'-prəv-īzˌ/ · Im·pro·vise · IPA /ˈɪmpɹəvaɪz/
01 v. t. To compose, recite, or sing extemporaneously, especially in verse; to extemporize; also, to play upon an instrument, or to act, extemporaneously.
imp. & p. p. Improvised; p. pr. & vb. n. Improvising
  1. 1.
    To compose, recite, or sing extemporaneously, especially in verse; to extemporize; also, to play upon an instrument, or to act, extemporaneously.
  2. 2.
    To bring about, arrange, do, or make, immediately or on short notice, without previous preparation and with no known precedent as a guide.
    “Charles attempted to improvise a peace.” Motley.
  3. 3.
    To invent, or provide, offhand, or on the spur of the moment; as, he improvised a hammer out of a stone.
02 v. i. To produce or render extemporaneous compositions, especially in verse or in music, without previous preparation; hence, to do anything offhand.
  1. 1.
    To produce or render extemporaneous compositions, especially in verse or in music, without previous preparation; hence, to do anything offhand.