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under sail
moving across water using wind power
under someone's nose
In plain sight, but unnoticed.
under the bootheel of
controlled by someone powerful
under the carpet
hidden or ignored to avoid trouble
under the covers
Beneath the blankets in bed.
under the gun
Feeling pressure to complete something quickly.
under the hammer
Being sold at auction.
under the illusion
believing something false
under the impression
Believing something to be true.
under the influence
Impaired by alcohol or drugs.
under the mahogany
Completely drunk and passed out.
under the microscope
carefully examined or scrutinized.
under the radar
Not attracting attention or notice.
under the rose
Secretly or discreetly; kept hidden.
under the rug
Hidden away or ignored.
under the sheets
intimate or secretive activities.
under the sun
In the world or existence.
under the surface
hidden beneath what is visible.
under the weather
Feeling ill or unwell.
under the wire
Just in time or at the last moment.
under way
In progress or happening now.
underage
not yet old enough for a specific activity
underappreciated
Not valued or recognized enough.
underbelly
The hidden, often negative side of something.