peeping tom
[noun]
Synonyms: peeper, voyeur

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Related Idioms: porch climber, window (or transom) peeper
Related Words: prowler, snoop, snooper

[TahlilGaran] English Synonym Dictionary ▲

peeping Tom /ˌpiːpɪŋ ˈtɒm $ -ˈtɑːm/ noun [countable]
someone who secretly watches people, especially people who are taking off their clothes, having sex etc ⇒ voyeur

[TahlilGaran] Dictionary of Contemporary English ▲

a peeping Tom
a man who secretly watches women while they are taking their clothes off or having sex.
I always close the curtains in case there are any peeping Toms across the road.

[TahlilGaran] English Idioms Dictionary ▲

a peeping Tom
someone who looks in the windows of strangers; someone who looks into someone's window (usually a woman) and watches them
The police arrested a peeping Tom near our apartment building last week.

There were several reports of a peeping Tom near our apartment building.

[TahlilGaran] English Idioms Dictionary ▲