to see (something) clearly (with the eyes or with the mind)

catch sight of; recognize and understand

an act of staring with the mouth open

gawk

to look with eyes wide open, e.g. in surprise or amazement

gaze

large glasses with special rims to protect the eyes from the wind, dust etc (as worn by motorcyclists)

gaze

(to pay attention in order) to hear

hear and pay attention

to see and notice, watch, (a person, act etc); to pay attention to (rules etc)

see, notice

to hear (a person, conversation etc) without the knowledge of the speaker(s), deliberately or by chance

hear and pay attention

to make a detailed examination of (something)

examine closely

to have, use, the power of sight; to understand (a person, thing); to think; the office, district, of a bishop

perceive with eyes

of see

perceive with eyes

of spy

secretly follow, watch another's actions