Idioms
on one's toes
alert
The teacher asks the students many questions to keep them on their toes.
on order
on par with (someone or something)
on pins and needles
on probation
on purpose
on sale
on schedule
on second thought
on shaky ground
on speaking terms with (someone)
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something else
lay over
catch one's breath
passport to (something)
stop, look, and listen
in person
implicate (someone) in (something)
smell a rat
make ends meet
ahead of schedule
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Fact
An unusually low sperm count is known as oligospermia, and the absence of any sperm from the semen is termed azoospermia.
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