noun
plural sights
[noncount] :the sense through which a person or animal becomes aware of light, color, etc., by using the eyes :the ability to see
[noncount] :the act of seeing someone or something
[noncount] :a position in which someone or something can be seen
The phrase out of sight, out of mind means that you stop thinking about something or someone if you do not see that thing or person for a period of time.
[count] someone or something that is seen
a famous or interesting place in an area - usually plural
[singular] informal :someone or something that is strange, funny, messy, etc.
sights [plural] :a goal or expectation
[count] :a device that is used to aim a gun
usually plural
[singular] informal :a large amount or extent :a lot
a sight for sore eyes
a person or thing that you are very glad to see
at first sight
drop out of sight
heave in/into sight
no end in sight
out of sight
US informal + old-fashioned :very good
sight gag
sight unseen
without seeing or examining something
verb
sights; sighted; sighting
[+ obj] :to see (something or someone that is being looked for or that is rarely seen or difficult to see)