Let fly and Rant at

Let fly verb - Fire as from a gun.

Rant at and let fly are semantically related. in lose one's temper with topic. In some cases you can replace term "Rant at" with "Let fly", this terms are similar.

Rant at verb - To criticize (someone) severely or angrily especially for personal failings.

Let fly and rant at are semantically related. Sometimes you can replace phrase "Let fly" with "Rant at", this terms are similar.