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listening (to a lecture, hearing, parliament session, etc.)

side

looking on

interception

bystander

behaving outrageously as though there were no one around

wiretapping law

utter stranger

looking on from the side

looking on by an outsider

to be seen from the point of view of an onlooker

near-earth object

onlookers

onlooker

hands-off

neighborhood

observer

marks or dots written alongside a word to indicate stress or draw the reader's attention

digression

subtitle (e.g. of a book)

observer

branch (of a river)

supporting evidence

(theatrical) aside

behaving outrageously as though there were no one around

collateral family

side of the road

collateral relation by blood

admission free

marginal notes

underline

near-Earth asteroid

admission fee

visitor's gallery

admission ticket

to step aside

looking on with folded arms (with one's hands in one's sleeves)

marginal notes

stand idly by and watch

things overheard

roadside

barge course

beside

parafollicular cell