Collocations for shoelace - noun

undone, untied
loose
knotted
a tightly knotted shoelace

pair

do up (BrE), knot, tie
He's still a little young to tie his own shoelaces.

undo, untie
retie (AmE)
break

be undone, be untied (AmE)
come undone, come untied (AmE)