1.crack2.gap between two objects3.gap in time between two events
1.interval2.gap3.clearance
gap; slit; crack; crevice; fracture
1.to seize an opportunity2.to exploit (a loophole)
to wait for the opportunity
a white steed flits past a crack (idiom); How time flies!
1.crepuscular rays2.sunbeams
1.lit. to look for holes, and observe gaps (idiom)2.fig. to search out one's opponent's weak points3.to look for the Achilles' heel