loop (line returning to its origin) / earring / buckle (of a belt, etc.) / curl (of hair) / ringlet / loop / loop jump / loop the loop (aircraft manoeuvre)

earring

Tour de France

on a loop, on repeat, endlessly

(programming) infinite loop

to come full circle

plural of boucle

(transitive) to buckle (to fasten) / (transitive) to curl (make curly) / (transitive, figurative) to tie up (close, finish (e.g. an affair or case)) / (transitive, colloquial) to shut / (intransitive) to curl up (become curly)

inflection of boucler:
/ inflection of boucler:

third-person singular future of boucler