"darle rienda suelta a" in English

rein

loose

to free- to let go- to let out- to unloosen- to disengage- to ease off- to give- to let in- to loose- to loosen- to scream- to spit out- to spout- to unchain- to uncoil- to unfasten- to unloose- to untie- to cough up- to give off- to gulp- to pony up- to shell out- to shell out- to stump up- to blurt- to burst out- to drop- to release- to unleash- to untighten- to come out with- to shed- to undo

refute

A

at- to- toward- on- within- into