a crack, chink, or narrow opening; rift

crack; rift; crevice or fissure in the ground or in rock

to patch up cracks and stop up leaks; used to describe making up for shortcomings or fixing defects in a system or piece of work

a crack or crevice in a rock

(literary) a crack, seam, or leak; an opening or hole

(literary) crack; slit; fissure