a period of time or a break between events or activities

a small, narrow opening, crevice, or gap

a physical space or crack between two objects

gap; slit; crack; crevice; fracture

pore (geology)

a white steed flits past a crack; refers to how time flies

to take advantage of a weakness or a flaw in a defense or system

hostility, animosity, or a rift in a relationship resulting from a grievance

a narrow opening, gap, or fissure in a physical object or surface

a physical space filled with air between two parts, such as in an electrical circuit or mechanical system

aperture

a deep-seated mutual hostility or a rift caused by hatred

to watch for an opportunity or opening

a small empty space, cavity, or lacuna within a structure

rays of sunlight that appear to radiate from the sun's position, shining through gaps in clouds

To look for an opening or vulnerability in an opponent's position in order to find an opportunity to act.