ret·ro·fire 
(rĕtrō-fīr′)
(rĕtrō-fīr′)v. ret·ro·fired, ret·ro·fir·ing, ret·ro·fires
v.tr.
To ignite or fire (a retrorocket).
v.intr.
To become ignited or fired. Used of a retrorocket.
- in the middle
- in the money
- in the name of
- in the nick of time
- in the offing
- in the public eye
- in the raw
- in the round
- in the running
- in the saddle
- in the same boat
- in the same breath
- in the short run
- in the soup
- in the street
- in the sun
- in the swim
- in the tank
- in the teeth of
- in the wake of
- in the way
- in the wind
- in the wings
- in the works
- in the world