With let (or allow). In later use frequently, to let (something) take its own course.

to give a person rope (also enough rope,etc.) and variants: to allow a person freedom of action, esp. in order to bring about his or her own…

figurative. To give freedom of action or expression to. Now chiefly with full. Cf. to give (a) free rein (to) at free rein, n. 1, with a loose rein…

to let go. To cease to restrain; to allow to take its course unchecked. to let oneself (or it) go: (a) to give free vent to one's enthusiasm; (b) to…

to give (a horse) his (also her, its,etc.) head (formerly also to give (a horse) (the) head): to give free rein to (a horse). Frequently in extended…

To allow liberty, free range, or scope to; to privilege, tolerate. Obsolete except in participial adj.

In allusive phrases referring to the ‘playing’ of a hooked fish at the end of the line; esp. to give line: to allow full play, scope, or latitude.

transitive. To fail to check.

to give a loose (occasionally give loose) to: to allow (a person) unrestrained freedom or laxity; to give full vent to (feelings, etc.); to free…

to give stretch to: to allow to act unchecked. Obsolete.

to let rip: to act or proceed without restraint; (also) to speak violently.