sub-
sʌb
sub- always lies one notch underneath something
The picture Something slides into the space directly beneath another thing, one notch lower. sub- lies underneath; super- sits on top.
Where the picture shows up in sub-
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a road under the ground
Take the subway to the clinic.
teɪk ðə ˈsʌbweɪ tuː ðə ˈklɪnɪk
Get the underground train to the clinic.
A train runs through a dark tunnel beneath the street.
sub (under) + way (road).
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letters along the bottom
Please turn on the subtitles.
pliːz tɜːrn ɑːn ðə ˈsʌbtaɪtəlz
Turn the captions on, please.
One line of text sits in the strip at the very bottom of the screen.
sub (under) + title.
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a total on the line below
Write the subtotal at the bottom.
raɪt ðə ˈsʌbtoʊtəl æt ðə ˈbɑːtəm
Put the running total at the bottom.
A line is ruled under the list of numbers and a smaller total is written beneath it.
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pushed up from below
Please submit the form by Friday.
pliːz səbˈmɪt ðə fɔːrm baɪ ˈfraɪdeɪ
Hand the form in by Friday.
Someone sitting at the desk slides the form up across it into waiting hands.
sub (from under) + mit (send).
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running under the sea
A submarine cable carries the signal.
ə ˈsʌbməriːn ˈkeɪbəl ˈkæriz ðə ˈsɪɡnəl
The signal travels along a cable under the sea.
One thick line lies along the seabed, far below the waves.
sub (under) + marine (sea).
All of it in one picture
sub- points at the slot one notch down. Put the road under the ground and you have a subway; lay the words along the bottom of the picture and you have subtitles. A total that sits on the line below the items is a subtotal; a form pushed up from your side of the desk into someone else's hands is submitted; a cable that runs along the floor of the sea is submarine. So when you see sub-, just ask what it is under.